Police in Las Vegas have arrested a man who identifies as a woman who had allegedly planned to carry out a massacre in a casino using a cache of weapons. 

Allison Howlett, 36, was charged with making terroristic threats, assault with a deadly weapon, auto theft, gun theft and other offenses, the New York Post reported. 

Howlett's former spouse, who is female, called police on Saturday to report Howlett had stolen her car. The spouse told police that there were numerous firearms in the car, according to Henderson Police Chief Reggie Rader. Howlett's ex-wife said that he intended to commit "suicide by cop" or carry out a mass shooting. 

Police were able to use the spouse's phone to track the stolen car, which led them to a garage at the Sunset Station hotel. 

Video and photos posted on Instagram by the Las Vegas Metropolitan Police Department show multiple handguns, rifles, a fully automatic firearm, suppressors, and hundreds of rounds of ammunition that authorities found in the vehicle. Police say that an additional 30 firearms were found at the suspect's residence. 

The post also shows the suspect being pulled by police from the vehicle as he reached for a bottle of water the officers had offered.