Gunmen shot to death the leader of Mexico's leftist Democratic Revolution Party in the southern state of Guerrero, authorities said today.
The killing prompted Guerrero's governor to cut short a trip to the United States aimed at convincing cruise ship lines that the state's flagship resort, Acapulco, was safe enough to bring their ships back for visits.
Some cruise ships have stopped visiting the Pacific coast state because of continued violence, like the assassination late yesterday of Demetrio Saldivar.
The state prosecutors' office said today that Saldivar was killed in the state capital, Chilpancingo.
The office said a witness watched as two men blocked Saldivar with a car, then shot and killed him before fleeing.
Saldivar was general secretary of the party known as the PRD in Guerrero. Local media reported he had previously occupied a post in the state government.
Guerrero was plagued by political violence in the 1990s, but has been hit even harder by drug gang violence in recent years.
The US cruise line Holland America announced in March that it had halted port calls at Acapulco and would sail to other destinations in the country "due to recent security concerns."
A few other cruise lines continue to make port calls in Acapulco, but those visits began to fall off steeply around 2010.
Governor Hector Astudillo traveled to Miami to try to convince cruise ship operators that safe perimeters had been established for passengers in Acapulco and the resort of Zihuatanejo.
But Astudillo tweeted that Saldivar's killing forced him to cut the trip short.
"These regrettable events have forced us to cancel the planned working trip and return to Guerrero as soon as possible," Astudillo wrote in his Twitter account.