DEIR AL-BALAH, Gaza Strip (AP) — An international United Nations staffer was killed and five others were wounded in a strike on a U.N. guesthouse in the Gaza Strip, a U.N. official said Wednesday.

Jorge Moreira da Silva, head of the U.N. Office for Project Services, declined to say who carried out the strike but said the explosive ordnance was “dropped or fired” and the blast was not accidental or related to demining activity.

He did not provide the nationalities of those killed and wounded.

The Israeli military, which has carried out a heavy wave of airstrikes since early Tuesday, denied earlier reports that it had targeted the U.N. compound.

This is a developing story. Please check back for updates.