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By Maher Nazeh and Saif Hameed CAMP TARIQ, Iraq (Reuters) - Islamic State militants fought back vigorously overnight and parried an onslaught by the Iraqi army on a southern district of the city of Falluja, the group's bastion near Baghdad, officers said on Tuesday. An aid official warned of a "human catastrophe" unfolding in the city, with residents unable to escape. Soldiers from the elite Rapid Response Team stopped their advance overnight about 500 meters (yards) from the al-Shuhada district, the southeastern part of city's main built-up area, an army commander and a police officer said.
U.S. oil prices rose on Tuesday, buoyed by the start of the U.S. summer driving season, while international fuel markets fell on rising output in the Middle East, which mostly serves Asian customers. U.S. West Texas Intermediate (WTI) crude oil futures were trading at $49.58 per barrel at 0707 GMT (04:07 a.m. EDT), up 25 cents from their last settlement. Brent crude oil futures were down 18 cents to $49.58 a barrel.