A congressional investigation after Israel's invasion of Lebanon in 1982 found Israel guilty of intentionally dropping cluster bombs in civilian areas.

A six year ban was imposed on further sales of the weapons to Israel.

The UN's Mine Action Coordination Centre says it has found 318 sites in south Lebanon where cluster bombs have been used.

"A lot of them are in civilian areas, on farmland and in people's homes, said spokeswoman Dalya Farran.

"We're finding a lot at the entrances to houses, on balconies and roofs," she said.

"Sometimes windows are broken and they get inside the houses."

"Most of them are from America," Ms Farran said.

According to the UN, eight Lebanese have been killed and at least 30 wounded by exploding ordnance left behind after the 14 August ceasefire between Israel and Hezbollah came into force.