An Israeli strike on a refugee camp in north Lebanon has killed Hamas official Saeed Atallah Ali and his family, the militant group said Saturday. Hamas later said another military wing member was killed in an Israeli strike in Lebanon’s eastern Bekaa Valley.

Eyewitnesses said the number of casualties could rise as the mosque was being used to house displaced people. The Israeli military said in a statement it “conducted a precise strike on Hamas terrorists who were operating within a command and control centre embedded in a structure that previously served as the ‘Shuhada al-Aqsa’ Mosque in the area of Deir al Balah”.

Israel has repeatedly targeted Hamas and Hezbollah officials in Lebanon since the Gaza war erupted almost a year ago.