The explosion in an Austin neighborhood Sunday night had “similarities” with the three bombs that detonated in the Texas capital earlier this month, leading authorities to determine that they are dealing with a “serial bomber” terrorizing the city, police said Monday.

A series of massive expl

An explosion and fire killed at least one person and injured 73 at the Williams Olefins chemical plant in Geismar, Louisiana, on Thursday, leading authorities to order people within two miles to remain indoors.

A massive explosion at a fertilizer plant in the small Texas town of West left at least two people dead, leveled several homes and prompted a widescale evacuation in the community of 2,600 people.

"It was a like a nuclear bomb went off," Mayor Tommy Muska said. "Big old mushroom cloud. There are a lot of people that got hurt. There are a lot of people that will not be here tomorrow."