As chaos erupts, U.S. travelers told to shelter in place in Puerto Vallarta, other parts of Mexico

U.S. citizens in Puerto Vallarta and elsewhere in the state of Jalisco were urged by the U.S. Embassy in Mexico to shelter in place on Sunday as chaos erupted after the Mexican army killed the leader of the powerful Jalisco New Generation Cartel, Nemesio Rubén Oseguera Cervantes – known as “El Mencho”.

The killing set off hours of roadblocks with vehicles burning in Puerto Vallarta, Guadalajara and other parts of Jalisco.

Videos on social media showed billowing plumes of black smoke over Puerto Vallarta...