At least 10 bodies have been pulled from a well near the site where members of a Mexican band went missing after a performance.
A total of 20 people disappeared on Friday following Colombian-style group Kombo Kolombia's show in Monterrey the previous night, including 16 musicians and crew.
An official from the Nuevo Leon State Investigative Agency said the number of bodies found at a vacant car park in the nearby town of Mina could increase.
But the official, who spoke on condition of anonymity because he was not authorised to discuss the case, could not confirm whether the bodies were those of the band and their crew.
People living near the bar in Hidalgo municipality north of Monterrey - where the band had played a private show - reported hearing gunshots at around 4am on Friday, followed by the sound of vehicles speeding away.
The official added that gunfire is common in the area, and that investigators found spent bullets nearby.
Relatives filed an official report about their missing loved ones on Friday, after they lost mobile telephone contact with them following the Thursday night performance.
When family members went to the bar to investigate, they found the band members' vehicles still parked outside.
For three years, Kombo Kolombia has played a Colombian style of music known as vallenato, which is popular in Nuevo Leon state.
Most of the group's musicians were from the area, and have held large concerts in addition to bar performances.
State officials said one of those missing is a Colombian citizen with Mexican residency.
Members of other musical bands, usually groups that performed 'narcocorridos' celebrating the exploits of drug traffickers, have been killed in Mexico in recent years.
But Kombo Kolombia did not play that type of music and its lyrics did not deal with violence or drug trafficking.