-- A federal search warrant was served Wednesday morning at the Garden Grove, California aerospace facility where a compromised tank carrying a toxic chemical forced the evacuation of tens of thousands of residents, ABC Los Angeles affiliate KABC has learned.

It's part of an investigation looking into possible violations at the plant that could have played a role in the incident at the GKN Aerospace facility last month.

A tank carrying 6,500 gallons of the highly toxic chemical methyl methacrylate (MMA) became unstable, causing the tank to heat up uncontrollably.