KUCB KIAL Unalaska Community Broadcasting

Laurel Wamsley

Authorities say a fourth device that exploded in Austin, Texas, this month indicates a "serial bomber" — and one who is more sophisticated than the earlier bombs suggested.

Austin Chief of Police Brian Manley said Monday that investigators believe a tripwire might have been used in the device that exploded in a Southwest Austin neighborhood on Sunday night, injuring two men.

Updated at 10:05 p.m. ET

Florida transportation officials say that an engineer with the private firm that designed the concrete bridge that collapsed Thursday called the state two days before the incident to report cracks in the structure.

It's not immediately known whether the reported cracks contributed to the collapse of the pedestrian walkway that was intended to join the campus of Florida International University and the city of Sweetwater.

In the latest battle involving the works of Harper Lee, the author's estate is suing producer Scott Rudin over the script of an upcoming Broadway play of To Kill A Mockingbird.

In a lawsuit filed in federal court in Alabama, Lee's estate complains that the new production by Rudin and writer Aaron Sorkin deviates too much from the novel.

The U.S. Justice Department has charged three Central Illinois men with the bombing of a Minnesota mosque in August.

Michael Hari, 47, Michael McWhorter, 29, and Joe Morris, 22, were charged with using an explosive device to damage the Dar al-Farooq Islamic Center in Bloomington, near Minneapolis. No one was hurt in the bombing, which exploded in the imam's office.

Two reports to the United Nations have found that Myanmar has carried out extreme human rights violations against the Rohingya people, abuses that are most likely crimes under international law.

The U.N. Human Rights Council heard both reports on Monday: one from the Independent Fact-Finding Mission on Myanmar, and another from Yanghee Lee, the U.N. Special Rapporteur on Human Rights in Myanmar.