BROWNSVILLE, RGV – Authorities say Matamoros Mayor Leticia Salazar was traumatized by Sunday’s attempt on her life.

Gunmen opened fire on a convoy carrying the mayor through her city on Sunday evening. She was riding in a bulletproof vehicle.

Authorities say the popular mayor, who has worked hard to build strong trading relationships in Brownsville and across the Rio Grande Valley, was not injured in the attack. Nor were her bodyguards.

The state government says the assailants were travelling in a car and a sport utility vehicle when they intercepted Salazar’s convoy on the outskirts of Matamoros.

Herminio Garza, Tamaulipas state secretary, told Televisa on Monday that the federal police had captured four suspected gunmen. He said the suspects told authorities they believed the convoy belonged to rivals encroaching on their territory, not the mayor, the AP reported.

The National Action Party, of which Salazar is a member, has condemned the attack and called on the federal and state government to catch the attackers, the Associated Press reports.

Matamoros has been the scene of bloody confrontations between factions of the Gulf cartel in recent weeks.

Only last week, Salazar sent out tweets advising Matamoros residents to take precautions because cartel violence was expected to escalate.

Salazar recently attended Brownsville Mayor Tony Martinez’s State of the City address. She was in Harlingen in December to sign a sister-city accord with Harlingen Mayor Chris Boswell. Salazar brought Matamoros into the Bi-National Economic Development Zone being fashioned by United Brownsville.

Editor’s Note: Matamoros Mayor Leticia Salazar is pictured above being interviewed by reporters at the Brownsville State of the City address held February 18 at the Brownsville Event Center.