AFP: Secret tunnels found on US-Mexico border: "'Illicit tunnel activity has been on the rise since the first documented tunnel was discovered in 1990. Since then, 154 tunnel attempts have been discovered, all but one of which were located along the southwest border' with Mexico, US Immigrations and Customs Enforcement (ICE) official James Dinkens told lawmakers.
'Over the past several years, law enforcement has seen a marked increase in the number and sophistication of tunnels,' he told a Senate hearing.
California Democratic Senator Dianne Feinstein said at the hearing that she would introduce a bill seeking to tighten an illegal tunnel-fighting law passed in 2007. The idea is to make illegal tunnel making a more serious offense: conspiracy. ...
"It is a real serious penetration into the US," said Feinstein, who leads the senate's anti-drug trafficking committee. "They could mobilize large groups.""