A Palestinian armed group has said that three of its leaders were killed in an Israeli strike on Beirut, the first attack within city limits as Israel escalated hostilities against Iran’s allies in the region, Reuters reports.

The Popular Front for the Liberation of Palestine (PFLP) said the three leaders were killed in a strike that targeted Beirut’s Kola district.

The strike hit the upper floor of an apartment building in the Kola district of Lebanon’s capital, Reuters witnesses said. The PFLP is another armed group taking part in the fight against Israel.

There was no immediate comment from Israel’s military.

Monday’s attack in the Kola district appeared to be the first strike within Beirut’s city limits. Syrians living in southern Lebanon who had fled Israeli bombardment had been sleeping under a bridge in the neighbourhood for days, residents of the area said.