Aerial surveillance of the cartels has increased, with at least 18 spy plane missions flown over the Southwest and near Mexico.

Brown said DEA and Homeland Security Investigations (HSI) personnel must intensify their investigations into underground tunnels to discover “cover-ups” of the tunnels’ US exits. “Cover-ups” are ...

Any intelligence gathered from Mexican territory would have to be shared under agreements between the two countries, Defense Minister Ricardo Trevilla said.