Bolivian security forces clashed with supporters of former President Evo Morales, leaving at least five people dead and dozens more injured.
A doctor in the central city of Sacaba said most of those killed and injured had bullet wounds.
However, no deaths were reported by the Bolivian authorities.
Morales, who said he was forced to resign last Sunday amid protests following the disputed presidential election, has fled to Mexico.
He later took to Twitter to broadcast that the massacre had occurred and to describe Bolivia’s interim government as a dictatorship.


Peace deal hopes fade after Trump rejects Iran proposal
UK's Starmer defies calls to quit, says he is getting on with governing
New Israeli law sets military tribunal for those linked to October 7 attack
Russia strikes Ukraine with drones as ceasefire ends
Dutch hospital quarantines 12 over breach of hantavirus protocol
Brazilian flotilla activist returns home, alleges torture during Israel detention
Seven killed in blast in northwest Pakistan market, police say
India's Modi to begin five-nation tour, including UAE
