US state department issues new terror warning

The US government is issuing a worldwide caution amid fears a terrorist strike is imminent.

Americans travelling abroad are being advised they should avoid clubs, restaurants, schools and outdoor sports events where gatherings could be targeted by terrorists.

Issuing the "worldwide caution", officials say they have credible evidence an attack is imminent.

The US State Department claims no specific target, timing or method is known, adding a suicide strike is a possibility.

"Recent attacks on worshippers at a church and synagogue underline the growing possibility that as security is increased at official US facilities, terrorists and their sympathisers will seek softer targets," a statement said.

Americans are being urged to be more aware of their security while in crowds, avoid them or find other places that do not attract many Americans.

The State Department issued a similar caution on March 17, after five people, including two Americans, died in a grenade attack on a Protestant church in Pakistan. The new statement extends the caution to October 1.

The FBI is to protect larger July 4th festivities as a precaution against a terrorist attack, says a US official.

He says although there is no known specific threat, the interrogation of detainees at Camp X-ray, revealed a general interest in the American Independence Day as a possible target.