An image of the incident immediately after (Source: Israel News Flash on Twitter)

At least four Palestinians from the same family have been killed and 13 people injured in the Gaza Strip by an explosion of Israeli military ordnance left over from last summer’s war, Palestinian officials said.

Gaza health ministry spokesman Ashraf al-Qidra said the ordnance exploded as Palestinian workers were helping family members remove rubble from a house destroyed in the 50-day war between Israel and the Hamas militants who rule the coastal territory.

The ordnance, described as a bomb on JPost, and  is believed to have been dropped in an air strike on the house during the war.

Last year, six people, including an Associated Press video journalist and his Palestinian translator, were killed as Gaza police engineers tried to defuse unexploded Israeli ordnance. Three people, including a press photographer, were badly injured.