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(KSL News/AP) -- A small explosion in a lounge area of the downtown public library Friday afternoon blew out a window on the third floor, and forced hundreds of people inside the building to evacuate, police said. No injuries were reported.
54-year-old Pat Rogers was using a computer two floors below when he heard a "big boom."
He says he thought something fell over. But he says, he could smell the explosive.
The block around Library Square was closed to the public as officers searched the building. Four hundred people inside the building were evacuated, Salt Lake City police Detective Kevin Joiner said.
The explosive was in a paper bag on the floor, near some desks and tables, he said.
ATF and FBI agents joined the Salt Lake City police bomb squad in checking what was left of the device, and to make sure there wasn't a second one hiding somewhere.
In all, the explosion only damaged the window. It can be fixed.
There were no reports of threatening phone calls to the library and "nobody has taken any responsibility at this point," Joiner said.
Close to 500 people were in the library at the time of the explosion. All of them were evacuated.
Witness: "We were just sitting there talking and reading and all of a sudden we just heard this big boom. And we looked down there and there's a chair sticking about this far through the window and the glass just shattered and all that stuff. And I talked to a guy who was sitting two chairs away and he said all he heard was like a ssssss and then boom."
Witness: "We were in the basement, in a lecture, and we heard this really bad blowing sound."
Police interviewed several of the workers at the library to see what they know. But still, no arrests.
Police: "We don't have any suspect information yet. We have some witnesses who are starting to give us information about some people who were seen sitting in that area, but we don't have that solid information yet."
Conrad Olsen, 45, was looking for jobs on a computer on the floor where the explosion occurred. Based on the sound, he believed it was on another floor.
Olsen said he smelled sulfur and saw a white fast-food bag blown open, but he saw no one.
From the street, investigators in white protective suits could be seen taking pictures and inspecting the third floor.
The library is expected to open again tomorrow.
The Associated Press Contributed to this story
