The US State Department on Thursday warned Americans travelling abroad of possible violence over a Florida pastor's plans to burn copies of the Koran, dpa reported.
The State Department said there could be anti-US demonstrations in many countries in response to the plans that could turn violent, citing protests that have already taken place in Afghanistan and Indonesia.
"The potential for further protests and demonstrations, some of which may turn violent, remains high," the department said, urging Americans to avoid demonstrations.
US officials have strongly condemned the plans of Terry Jones and his Dove World Outreach Centre church to burn the Koran on Saturday to mark the ninth anniversary of the September 11, 2001 terrorist attacks on the United States.
Jones has vowed to proceed despite mounting public pressure to abandon the plans.