The State Highway Patrol says it will help with a renewed investigation of the Taum Sauk reservoir collapse. It’s been only about six weeks since the Patrol finished its criminal investigation without naming any suspects. The Patrol’s report led Attorney General Jay Nixon to drop thoughts of filing criminal charges. But the Patrol report said a backup alarm system did not work and had been moved by the time a state dam safety officer visited the scene after the collapse.

Reservoir owner Ameren says it told the Patrol about the probes more than a year ago and gave the Patrol names of those who moved them. The company says the probes were moved while the company investigated the collapse, not before the collapse.