MOSCOW âÂ A team of Russian detectives arrived in Turkey on Tuesday to join the investigation into the slaying of MoscowâsÂ ambassador by a Turkish police officer â an act portrayed by both countries as an effort to rupture a rapprochement between the two regional powers backing opposite sides in Syriaâs civil war.
The attack Monday also touched off sweeps across Turkey as authorities hunted for clues in the life of the 22-year-old gunman, who decried the violence in Syria after pumping several bullets into the ambassador at a photo exhibit.Â
Russia is a key ally of Syriaâs government while Turkey has been a stalwart backer of rebel factions, although both nations have worked together on a plan to evacuate civilians and opposition fighters from their last enclave in the embattled Syrian city of Aleppo.
Officer Mevlut Mert Altintas gunned down Ambassador Andrei Karlov as the diplomat spoke before an exhibition of Russian photos at an art gallery in the Turkish capital of Ankara.
After killing the ambassador, Altintas, an officer with the riot police, denounced Russiaâs role in the Syrian war, screaming: âDonât forget Aleppo! Donât forget Syria!âÂ He was later killed in a gun battle with the police.Â
The assassination, which was captured in stunning detail by an Associated Press photographer and other journalists, brought into sharp relief the violent worldwide reverberations of Syriaâs bloody civil war.
TheÂ ambassadorâs killing has also shocked Turkey, adding to a string of recent militant attacks and political turmoil that have hurt the economy and increasingly isolated the country. Â
âI believe that every person who is going to Turkey should think twice before doing so, because terror attacks have been happening there on a practically daily basis,â Russian Deputy Foreign Minister Oleg Syromolotov told reporters in Moscow.Â
TurkeyÂ remained on edge on Tuesday, as authorities detained relatives of Altintas and searched his family home in the Soke district, in the west of the country, Turkish media reported. In what appeared to be a separate incident, a man fired shots near the entrance of the U.S. embassy in Ankara overnight. A State Department official said that no one was hurt. Â
Turkeyâs semiofficial Anadolu News Agency said that the embassy gunman, who was identified only as Sahin S, fired several shots in the air with a pump-action rifle he had hidden under his coat early Tuesday.Â
He was detained and was being questioned, the news agency said.Â The embassy, as well as the U.S. consulates in Istanbul and Adana were closed on Tuesday because of the shooting, according to a State Department statement. Â Â
Â Karlov regularly traveled around Ankara without police protection, an unusual decision given the heightened level of threat in the country since a July attempted coup and a string of terrorist attacks by militant groups, Turkish officials said.
While the shooting probe was still in its early stages, investigators believe there may be links between Altintas and a shadowy movement led by Fethullah Gulen, an exiled Turkish preacher who lives in Pennsylvania, according to a senior Turkish official. Erdogan has accused the movement of mounting a failed coup in July, and since then, frequently implicated the group in various plots to destabilize Turkey.
GulenÂ has denied involvement in the coup, and he released a statement on Monday condemning the killing of Karlov.
The official, who requested anonymity because he was not authorized to speak to the news media, said investigators had preliminary information suggesting that Altintas had entered a police college in 2012, after getting referrals from suspected Gulenists. Altintas also took two days off from work on the day of the attempted coup and then traveled to Ankara, the official said. Â
He was allowed to carry a weapon into the event with Karlov because he was carrying a police identification, officials said.Â There was not yet anyÂ evidence to suggest that Altintas belonged to any radical Islamic groups, such as Islamic State or the Nusra Front, an al-Qaeda affiliated group, investigators said.
At the time of the shooting, the Turkish foreign minister was on a plane en route to Russia to take part in a meeting with his Iranian and Russian counterparts Tuesday, as part of the effort to halt hostilities in Syriaâs civil war.
At the start of the trilateral talks, Turkish Foreign Minister Mevlut Cavusoglu said he was confident that the meeting âwill have crucial significance for the situation in Syria,â the Interfax news agency reported.
âOur interaction on Aleppo has allowed us to score a number of successes. Now I would like this interaction to spread to other districts of Syria to secure a cease-fire all over the country,â the agency quotedÂ Cavusoglu as saying.
Russiaâs defense minister, Sergei Shoigu, also held talks with his Turkish and Iranian counterparts, and said the three sides would issue a joint statement on a settlement in Syria.
The shooting was among the most brazen retaliatory attacks yet on Russia since Moscow entered the war in Syria on the side of President Bashar al-Assad and unleashed a bombardment on Aleppo that has drawn international condemnation for what observers on the groundÂ have called indiscriminate attacks on civilians.Â
Russian President VladiÂmir Putin on Monday night called the shooting a âprovocation aimed at rupturing ties between Russia and Turkey,âÂ a statement later echoed by Erdogan.
Erdogan and Putin, two strongmen with global aspirations, have found common ground in recent months in their desire to secure an end to the Syrian war that would guarantee their long-term influence at a time when U.S. diplomacy has collapsed.
The newfound cooperation between Russia and Turkey over Syria was exemplified byÂ the deal they brokered last week for the evacuation of besieged people from the last few blocks of rebel-held territory in eastern Aleppo.
The statements by Putin and Erdogan suggested that the assassination may not disrupt their budding convergence of interests. Until last summer, the two presidents had been bitter rivals over Syria, supporting opposite sides in the war and embroiled in recriminations over the shoot-down by Turkey of a Russian fighter jet in November 2015.
Many players risk losing out in any Russian-Turkish deal over the future of Syria, including the U.S.-backed Syrian opposition, extremists with the Islamic State,Â and Syriaâs al-Qaeda affiliate.
The United States, meanwhile, joined other nations in condemning the shooting.Â
âOur thoughts and prayers are with his loved ones, the Russian people, and with the other victims who were injured in this shooting,â Secretary of State John F. Kerry said in a statement.Â âWe stand ready to offer assistance to Russia and Turkey as they investigate this despicable attack, which was also an assault on the right of all diplomats to safely and securely advance and represent their nations around the world.â
Karlov started his diplomatic career in 1976 during the Soviet eraÂ and took the post in Ankara in July 2013, according to the embassyâs website. Putin referred to him as a âbrilliant diplomatâ who âhad excellent relations with the leadership of Turkey and other political forces.â
The incident could spur even more vigorous efforts between Russia and Turkey to secure their role as Syriaâs main power brokers and negotiate a settlement to the war on their terms. Aaron Stein, a resident senior fellow at the Atlantic Councilâs Rafik Hariri Center for the Middle East, said that any fallout âwill entirely depend on Russiaâs reaction.âÂ
âAll indications thus far is that they will retain the relations they have built with Turkey since the rapprochement a couple of months ago,â he added.
The recent cease-fire cobbled together was to Russiaâs long-term benefit in Syria, while also addressing Turkeyâs real concern about civilian casualties, Stein said.Â
Fahim reported from Cairo, Entous from Washington. Brian Murphy, Carol Morello andÂ Karen DeYoung from Washington, Zeynep Karatas in Istanbul and Erin Cunningham in Irbil, Iraq, contributed to this report.