At least 20 people were wounded when unidentified miscreants tossed a bomb into a bar in a resort city on Mexico's Pacific coast, police said.
The attack occurred at the Pink Cheladas bar in Puerto Vallarta city, where about 150 young people in their 20s were partying, a police department spokesmen said on Thursday.
Two of the victims had to have their limbs amputated.
The assailants threw the bomb inside the bar and it exploded nearly in the middle of the establishment, the spokesmen said.
No threats had been received by the Pink Cheladas bar before the attack, police said.