MOSCOW — A homemade bomb carried by a woman killed three people and injured at least 21 in an explosion near an upscale restaurant in central Moscow ​on Saturday evening, authorities said.The explosion occurred just before 2000 ​local time close to an Italian restaurant located in one ⁠of Moscow’s seven Stalin-era skyscrapers at Kudrinkskaya Square, the police said.Russia’s Anti-Terrorism Committee said that ​an unidentified woman had tried to get into the restaurant but was stopped by ​a security guard, the state RIA news agency reported.It said the woman, the security guard and a customer at the Balzi Rossi Italian restaurant had been killed in the ​blast that followed.Those injured received wounds of varying seriousness, the police said.Russia’s state ​RIA news agency released video of heavily armed law enforcement officers at the scene, which ‌had ⁠been closed off to the public.The authorities did not name those killed or injured nor did they say who they thought might have been responsible.More than four years into a full-scale war with Ukraine, Russia’s FSB security service said earlier ​this year that authorities would step ​up protection for ⁠high-ranking military officials after a series of assassinations and attempted killings it blamed on Kyiv.The Kommersant daily newspaper cited its ​own sources as saying that the bomb had been intended ​to maim ⁠and kill guests who were enjoying themselves on the restaurant’s summer terrace outside.It suggested that the bomb had been set off by someone else remotely and ⁠that the ​woman carrying it may not have known ​that it was an explosive device.The restaurant’s website said the venue had been closed on Saturday for ​a private event.