New York Attorney General Eric Schneiderman and attorneys general from 10 other states filed a lawsuit against the U.S. Environmental Protection Agency Monday for what they say is an illegal delay of a safety rule for chemical plants.

A spokesman for EPA Region 2, which includes New York, did not immediately respond to a request for comment.

The Obama-era Chemical Accident Safety Rule, which was finalized in January 2017, requires companies to better prepare for possible accidents. The rule, which was partly a response to a 2013 explosion at the West Fertilizer Co. in Texas that killed 15 people and destroyed hundreds of homes, also expanded the EPA's authority to investigate and audit companies.