(CNN) -- A U.S. Air Force B-52 with six crew members on board crashed off the island of Guam on Monday, an Air Force spokesman said.
Search crews have found no survivors, but they are still looking, said Lt. Elizabeth Buendia, a spokeswoman for the U.S. Coast Guard in Guam. They located an oil slick but have not seen any wreckage, she said.
Rescuers with the U.S. Coast Guard and U.S. Navy were searching a point in the Pacific Ocean about 30 miles northwest of Guam, a U.S. territory, where the plane is believed to have crashed, said Capt. Joel Stark, spokesman for Andersen Air Force Base.
He had no information on whether anyone survived.
The B-52H Stratofortress was based at Barksdale Air Force Base in Louisiana, and was in Guam as part of a four-month rotation, Stark said.
It went down about 9:45 a.m. local time (7:45 p.m. ET Sunday).
A B-52 from Andersen Air Force Base was scheduled to fly over crowds celebrating Liberation Day, which commemorates the U.S. capture of Guam from Japan in 1944, Stark said.
But it was unclear whether the plane that crashed was the one that had been scheduled to perform the flyover.
In February, a B-2 stealth bomber crashed shortly after takeoff from Andersen Air Force Base in Guam. Two crew members ejected and were in good condition afterward.
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