TUCSON, Ariz. (AP) -- Federal authorities say they've seized more than 6,100 pounds of marijuana in two separate incidents in southern Arizona.U.S. Border Patrol agents responded to reports of suspected narcotics smuggling east of Douglas on Tuesday afternoon.Two Mexican men were arrested and a search of their pickup truck turned up more than 1,500 pounds of marijuana, valued at $777,000.The names of the two arrested men weren't immediately released Wednesday.A short time later, agents from the Nogales Station came across an abandoned van near the Mexico border.They say 189 bundles of marijuana weighing more than 4,600 pounds were found inside the vehicle. The marijuana is valued at more than $2.3 million.© 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.