The roof of a church has collapsed in northern Mexico during a Sunday mass, killing at least nine people and injuring about 50, authorities said as searchers probed the wreckage late into the night looking for survivors and other victims.

Approximately 30 parishioners were believed to have been trapped in the rubble when the roof caved in, officials said. Searchers crawled under the roof slabs and officials brought in dogs to help search for possible survivors.

The Tamaulipas state police said that about 100 people were in the Santa Cruz church at the time of the collapse.