City of Henderson issued the following announcement on November 03.
Hazardous materials response personnel from the Henderson, Las Vegas and Clark County fire departments will participate in a training exercise at the Olin Corporation facility near I-95 and I-215 on Monday, Nov. 8 from 1-5 p.m. The exercise is closed to the media and the public.
Media and area residents and businesses are advised to not be alarmed if they spot heavy fire and police activity and firefighters dressed in Level A HazMat suits at the Basic Management Inc. (BMI) complex located on unincorporated Clark County land in Henderson.
In addition to HazMat personnel from the Henderson, Las Vegas and Clark County fire departments, agencies participating in the training include Henderson Police, Fusion Center, Union Pacific Railroad and National Weather Service.
The exercise is being hosted by the Southern Nevada Community Awareness Emergency Response Association, or CAER, which is comprised of first responder agencies and businesses in and around the BMI complex that recognize the need to plan for any possible emergency involving the chemicals they handle.
Original source can be found here.