UPDATE 1-Migrant protesters occupy U.S.-Mexico border bridge, crossing closed

GATEWAY BRIDGE, U.S.-Mexico border, Oct 10 (Reuters) - M igrants seeking asylum in the United States who are camped in a dangerous Mexican border town occupied a bridge to Brownsville, Texas on Thursday, leading U.S. authorities to close the crossing, witnesses and authorities said.Hundreds of the migrants have been sleeping for weeks on the end of the bridge in Matamoros, Mexico, a city known for gang violence and for cartels that control human trafficking.Many of those living in tents or on th