Jerusalem, March 20 -- Israel on Wednesday expressed "sorrow" over the death of a Bulgarian United Nations staff member in strikes on UN guesthouses in Gaza's Deir al-Balah but said an initial investigation found no Israeli involvement in the incident.

The United Nations said the staffer, employed by the UN Office for Project Services (UNOPS), was killed when two UN facilities were hit. Five other personnel sustained serious injuries.

Israeli Foreign Ministry spokesperson Oren Marmorstein said a preliminary inquiry "found no connection" between Israeli military operations and the strike.

"The circumstances of the incident are being investigated," he said, adding that Israel facilitated the evacuation of the victim's body and the wound...