Travelers mull safety amid Arizona-Mexico border violence

FILE - In this March 18, 2016, file photo, a U.S. Customs and Border Patrol truck patrols the U.S. border with Mexico in Douglas, Ariz. An unusual str...

FILE - In this March 18, 2016, file photo, a U.S. Customs and Border Patrol truck patrols the U.S. border with Mexico in Douglas, Ariz. An unusual str...

FILE - In this Sept. 27, 2010, file photo, contractors reinforce a section of damaged border fence in Douglas, Ariz., as seen from Agua Prieta in Sono...

FILE - In this Sept. 27, 2010, file photo, contractors reinforce a section of damaged border fence in Douglas, Ariz., as seen from Agua Prieta in Sono...

FILE - In this Sept. 27, 2007, file photo, a man walks alone on the beach during sunset in Puerto Penasco, Mexico. An unusual string of violence south...

FILE - In this Sept. 27, 2007, file photo, a man walks alone on the beach during sunset in Puerto Penasco, Mexico. An unusual string of violence south...

FILE - In this Sept. 27, 2007, file photo, governors representing states along the U.S.-Mexico border pose for an official portrait in Governor's Plaz...

FILE - In this Sept. 27, 2007, file photo, governors representing states along the U.S.-Mexico border pose for an official portrait in Governor's Plaz...

PHOENIX (AP) — An unusual string of violence south of Arizona's border with Mexico has sparked travel warnings by American authorities.

Unaccustomed to the kind of violence long seen along some parts of the Texas-Mexico border, frequent border crossers in Arizona say they'll now think twice about traveling after dark and will confine themselves to busy commercial areas.

The precautions follow a fatal border shootout and the killing farther south of three women and six children in an ambush by cartel gunmen.

In addition, authorities discovered at least 42 bodies and skeletons last month in pits near the Gulf of California.

Since April, the U.S. State Department has suggested that U.S. citizens reconsider travel plans to Sonora, calling it a key location for the drug trade and human trafficking.

Still, the violence has not deterred some Americans who visit the resort town of Puerto Penasco, also known as Rocky Point.