PROVO, Utah (AP) _ A homemade bomb exploded on the campus of Brigham Young University in a ''deadly prank'' that injured a student who was trying to stamp out the device's fuse, police said.

Thella May Hall, 28, Salt Lake City, happened to see the burning fuse Wednesday night before the device went off, burning her and rupturing her eardrums, authorities said.

Police said they were looking for three men who were seen carrying the bomb and laughing after the explosion.

''This is a deadly, deadly prank,'' said campus police chief Robert Kelshaw.

He said there was no link between the bombing and three blasts that killed two people and injured another in Salt Lake City this month.

BYU President Jeffrey Holland said the explosion shook his house about one block away.