Venezuelan opposition politicians are demanding the government do more to determine what happened to a group of missing miners allegedly killed by gang members.

Officials say they are continuing to search for 28 miners who relatives say were dismembered and disappeared by a gang seeking to take over a disputed gold claim in the southeastern state of Bolivar.

The country's opposition-controlled Congress plans a discussion Tuesday of whether state agents might have been involved in the disappearances.

Families and people who said they witnessed the attack accused law enforcement agents of participating.

Bolivar state Gov. Francisco Rangel says there is still no proof of a massacre. He's a staunch ally of Venezuela's governing socialist administration,