Belgium has summoned the Israeli ambassador to complain about the destruction of the country’s development agency office in Gaza, Al Jazeera reports.

The office was in a six-storey building in Gaza City. The foreign ministry says it believes none of the agency’s staff was present when the building was bombed.

“The destruction of civilian infrastructure is absolutely unacceptable and does not comply with international law,” it said. Given the ongoing conflict in Gaza, Belgium decided two weeks ago to pull all development agency staff and their families out of the territory.

“We very much hope that these people — including many children — will be able to leave Gaza quickly and unharmed,” the ministry said.