TASHKENT, May 17 (Reuters) - Uzbekistan's nascent opposition movement, galvanised by the bloody suppression of a revolt in the east, urged the United States on Tuesday to help it oust hardline President Islam Karimov.

Dozens of human rights and opposition activists gathered outside the U.S. embassy in the capital Tashkent despite police attempts to prevent the rally which comes after troops opened fire on protesters in the town of Andizhan on Friday.