Five explosions in a raw shakes Texas

The latest explosion took place at a FedEx distribution facility in the town of Schertz near San Antonio.

Quoting FBI agents, The Washington Post reported that the new package had been bound for Austin, the state's capital.

This was the fifth explosion to hit Texas in less than three weeks.

The first blast was a package bomb that exploded at a northeast Austin home on March 2, killing Stephen House, 39. Two more package bombs detonated farther south on March 12, killing 17-year-old Draylen Mason and injuring two women, including his mother.

The fourth explosion rocked southwest Austin on Sunday, sending two men, both in their 20s, to hospital with serious, but non-life-threatening injuries.

Authorities said the first explosions involved packages left overnight on doorsteps. The forth one, however, was triggered by a tripwire.

"With this tripwire, this changes things," said Christopher Combs, special agent in charge of the FBI's San Antonio division. "It's more sophisticated, it's not targeted to individuals ... a child could be walking down a sidewalk and hit something."