Over 100 guests were on the dance floor when the hotel wall and roof collapsed, bringing the celebration to an abrupt end, Peru's National Institute of Civil Defense (Indeci) said.
"The mudslide broke through the walls of the hotel, entering into it with force," Town Mayor Evaristo Ramos said in an interview with a local radio station.
Authorities say the season's extreme rains triggered the accident and emergency personnel remain at the scene, recovering wedding guests still trapped beneath the rubble. Fifty people are believed to have been near the wall when it collapsed.
"#IntenseRains caused a wall to collapse at the Alhambra Hotel during a marriage in Tamburco, Abancay-Apurimac. @bomberosPE and @PoliciaPeru continue to search for survivors. So far, 13 deaths are reported. 30 wounded. #COENmonitorea"
Indeci director Jorge Chavez said, "At the Alahambra hotel, where the marriage was celebrated, 13 people were found dead and two people died in the hospital.”
Victims are being treated at the Regional Hospital of Abancay; so far 15 have been discharged having only suffered minor injuries. Indeci has directed family members to corresponding health centers to identify their relatives.