The Mexican government filed another U.S. gun lawsuit Monday, this time against five U.S. gun shops and distributors it claims are responsible for the flow of illegal weapons into Mexico.

Mexico’s first lawsuit, which was recently dismissed, targeted U.S. gun manufacturers. The second, which Foreign Affairs Secretary Marcelo Ebrard said was filed in Arizona’s federal district court Monday, targets gun dealers.

“We are suing them because clearly there is a pattern, we contend that it is obvious that there is weapons trafficking and that it is known that these guns are going to our country,” Ebrard said.

Ebrard promised last week the new lawsuit would target gun shops or dealers in U.S. border states who sell guns to “straw” purchasers who pass them on to smugglers, who then take the weapons into Mexico.

Mexico is suing for unspecified monetary damages and to demand the gun stores hire independent monitors to ensure that U.S. federal laws are followed in gun purchases.

Alejandro Celorio Alcántara, the legal adviser to Mexico’s Foreign Relations Department, said Mexico had chosen “the five worst stores” to name in the lawsuit, including three gun outlets in Tucson, one in Phoenix and one in Yuma, Arizona.