Witnesses in Burma have reported two explosions in the country's main city, Rangoon.

They say Burmese security forces sealed off a park and a bus station hit by the explosions, which happened Tuesday night about an hour apart.  The witnesses say police brought in bomb-sniffing dogs and ordered onlookers to disperse.

Burma's military rulers made no comment on the explosions and there were no reports of serious casualties.

Burma has seen several small bombings in recent years. The military government has blamed them on its political opponents or ethnic rebel groups seeking autonomy. The groups deny carrying out such attacks.

Burma has been under near-continuous military rule since 1962.