JERUSALEM, April 19 -- Two civilian contractors delivering water for the UN children's fund were shot dead by Israeli troops in northern Gaza, Unicef said on Saturday, expressing fury over the deaths the previous day.

"Unicef is outraged by the killing of two drivers of trucks contracted by Unicef to provide clean water to families in the Gaza Strip," it said in a statement.

Contacted by AFP, the Israeli military said troops saw "two armed terrorists in the area of the Yellow Line" - which marks the boundary of the area under Israeli control - approaching, so they "opened fire".

The army said the incident was "under review".

Unicef said the incident took place at the Mansoura water filling point in northern Gaza, which is "the only op...