BANGKOK (CNN) -- Witnesses told CNN Tuesday that tanks are in downtown Bangkok heading for government buildings for unknown reasons.
Rumors have been swirling in the Thai capital that a coup d'etat was being planned, CNN's Dan Rivers reported.
Thai Prime Minister Thaksin Shinawatra, who is currently at the U.N. headquarters in New York, has been under considerable pressure to step down.
According to officials at the Thai mission at the United Nations, Thaksin has moved up his speech to the General Assembly to Tuesday night and will return to Bangkok after his address.
He had been scheduled to address the assembly on Wednesday.
Elections in Thailand are scheduled for November after the country's constitutional court ruled April's vote was unconstitutional. (Posted 11:37 a.m.)