U.S. troops to arrive at Mexico border Aug. 1

WASHINGTON (Reuters) - U.S. National Guard troops will begin arriving along the border with Mexico on Aug. 1 to bolster security as the Obama administration tries to stem the flow of illegal immigrants, weapons and narcotics, officials said on Monday.

About 300 Customs and Border Protection agents and officers also will be sent to the border region, along with additional helicopters and other surveillance equipment, they said.