WASHINGTON - FEDERAL authorities are warning law enforcement personnel of a possible terror plot against the New York City subway system during the holiday season.

An internal memo obtained by The Associated Press says the FBI has received a 'plausible but unsubstantiated' report that Al-Qaeda terrorists may have discussed in late September attacks against the subway system.

BAGHDAD - IRAQ'S parliament on Wednesday delayed a vote on a landmark pact setting a deadline for US troops to leave, after agreeing to Sunni Arab demands to make it dependent on a referendum but rejecting other conditions.

The deal paves the way for US troops to withdraw by the end of 2011, bringing closer to an end the 2003 US-led invasion that ousted former dictator Saddam Hussein only to usher in years of sectarian bloodshed.

WASHINGTON - US officials have found trace amounts of melamine in a single sample of infant formula made in the US, but believe the contamination resulted from the manufacturing process and was not intentional, CNN reported on Wednesday.

Of 77 samples tested, one contained traces of melamine, FDA spokesman Judy Leon told CNN. A reading of less than 250 parts per billion is considered trace.