Witnesses say three British citizens have been kidnapped by gunmen in the southern Gaza Strip, after crossing into the territory from Egypt.

Security officials in Gaza say one of the victims is a human rights worker. There was no claim of responsibility, and Palestinian authorities say they have begun a search.

Recent kidnappings in Gaza have ended peacefully with the hostages released unharmed. In several cases, the kidnappers were either seeking jobs with the Palestinian Authority, or the release of imprisoned relatives.

Some information for this report provided by Reuters, AP and AFP.