WASHINGTON (CNN) -- FBI Director Robert Mueller said Thursday that secret government surveillance programs disclosed by leaks of classified information have been conducted in adherence with the U.S. Constitution and federal laws.

The inspector of a downtown building that collapsed last week has killed himself, city officials said Thursday.

(CNN) -- A Geismar, La., chemical plant exploded and caught fire Thursday, causing multiple injuries and forcing authorities to evacuate the area around the facility, officials told CNN.

Interest in arming teachers has grown among some school staff, gun rights groups and lawmakers in the aftermath of the mass shooting at Sandy Hook Elementary School, in which 20 students -- ages 6 and 7 -- and six adults were killed in Newtown, Connecticut on December 14. Gun rights groups have sponsored classes for teachers in a number of states-- from Texas to Ohio.

An Ohio man accused of murder, rape and holding three women in a Cleveland house against their will pleaded not guilty Wednesday. His attorney said it was an effort to stave off a death penalty and an arduous trial.

A major immigration bill that would give millions of people living illegally in America a path to citizenship cleared a key legislative hurdle Tuesday when a strong Senate majority voted to open debate on it.

The man who shook the U.S. intelligence community by leaking details of secret surveillance programs is believed to be staying in a "safe house," the British newspaper that worked with him reported Wednesday.

This year's Juneteenth promises to be a big one, with food, free children's activities, arts events and a parade celebrating the 150th anniversary of the Emancipation Proclamation itself.

HONG KONG (CNN) -- U.S. authorities are preparing charges against Edward Snowden, the man who outed himself as the source of secret documents detailing government surveillance of telephone and Internet communications, a law enforcement source told CNN on Tuesday.

(CNN) -- Bill Daley, who served as President Barack Obama's chief of staff for one year between 2011 and 2012, announced Tuesday he was launching an exploratory bid for Illinois governor.