Texas plant blast: Criminal probe opened three weeks on
11 May 2013 Last updated at 07:56 BST
Texas authorities have launched a criminal probe into a deadly explosion at a fertiliser plant in April.
The incident "severely impacted" the community in the town of West, a law enforcement official said.
The 17 April explosion at West Fertilizer Company killed 14 people, wounded 200, and caused a tremor as powerful as a small earthquake.
Mark Mardell reports from Washington.