http://news.bbc.co.uk/2/hi/middle_east/3170115.stm
The Palestinian group Hamas has called off its ceasefire after an Israeli missile strike killed one of its leaders in Gaza City.
Helicopter gunships fired several missiles at a car, killing Ismail Abu Shanab, one of Hamas' best-known leaders, and two of his bodyguards.
Within minutes, Hamas declared an end to the temporary truce it announced on 29 June and vowed revenge.
The air strike came hours after the Israeli Government decided to take military action against Palestinian militants following a suicide bombing in Jerusalem on Tuesday, which killed 20 people.
The upsurge in violence threatens to derail the US-backed roadmap for peace, accepted by Israel and the Palestinians as a way to end the three-year-old conflict.
Palestinian Prime Minister Mahmoud Abbas - also known as Abu Mazen - said the Israeli attack would undermine plans by the Palestinian Authority to rein in militant groups, which it announced in the wake of the Jerusalem bombing.
Another leading militant group, Islamic Jihad, is reported to be deciding later on Wednesday whether to end its truce.