Police in Texas may have found a mass grave containing up to 30 dismembered bodies, possibly all children, according to local media reports.

But the Liberty County sheriff's office said there was no evidence yet that any bodies had been discovered.

Sheriff's department spokesman Rex Evans said the office had received an anonymous report on Tuesday that there were bodies in the house in rural Liberty County, around 70 miles east of Houston.

KPRC television, a local station, said 25 to 30 bodies were found by officers acting on a tip-off.

FBI spokeswoman Kim Barkhausen in Houston confirmed to the Reuters news agency that the FBI had been asked to help with an investigation, but would not elaborate.

Preliminary reports indicated the bodies are those of children, the TV station reported.

One local paper, the Cleveland Advocate, said the tipster told authorities dozens of dismembered bodies were buried at the scene.