The Malaysian government has warned the U.S. Embassy about an "unverified threat" in central Kuala Lumpur (search), the country's main city, the embassy said Thursday.

The embassy did not say whether the threat was terrorist-related.

"The American Embassy in Kuala Lumpur has received information from the Malaysian government regarding an anonymous, unverified threat in central Kuala Lumpur," it said in an advisory to U.S. citizens in Kuala Lumpur.

"The U.S. government is working with the Malaysian authorities to try to verify this information. American citizens may notice an increase in security around Kuala Lumpur as a precautionary measure," it said.

The embassy did not elaborate.

Kuala Lumpur police chief Mustafa Abdullah (search) declined to comment on the statement, but said "we are carrying out our normal patrols around Kuala Lumpur."

Other Malaysian security officials were not immediately available for comment.

The U.S., British, Australian and other diplomatic posts in Malaysia have been on high alert for possible terrorist attacks since the Sept. 11, 2001 (search), attacks in the United States.

Kuala Lumpur has been used several times in the past for al-Qaida meetings, including ones in which the Sept. 11 attacks were allegedly planned.

However, militant Islamic activity in Malaysia declined significantly after the arrest and detention of scores of suspected militants between 2000 and 2002.