Palestinian armed groups have used a new type of bomb in their fight against Israel.

Two barrels with explosives that washed up on Israeli coasts earlier this week - but were defused safely - are being called "floating bombs".

A number of Palestinian armed factions say their motive for the bomb attempt was to avenge an Israeli raid in the West Bank last month that killed 3 Fatah members.

Israel says it's taking the threat seriously.

From Gaza, Al Jazeera's Ayman Mohyeldin reports.

[February 4, 2010]