A Blue Alert has been issued in Oklahoma as the manhunt continues for a fugitive accused of shooting an officer at an Immigration Customs and Enforcement (ICE) facility in Texas.

The Blue Alert system, launched in 2008, is designed to help locate suspects who have seriously injured or killed law enforcement officers.

Hundreds prayed, wept and held one another at a Texas prayer service for the 120 people who died in catastrophic flash floods and the many more reported missing.

The Texas flood smashed through buildings, carried away cars and ripped sturdy trees out by the roots, dropping the debris in twisted piles when the water finally ebbed.