
IMAGE SOURCE, US ATTORNEY’S OFFICE, CALIFORNIA Image caption, The cross-border passage was described as “sophisticated” by prosecutors
By Megan Fisher
BBC News
With a length of 1,744ft (531m), the passage had a rail track, electricity and a ventilation system.
US authorities had been carrying out surveillance at a property previously used as a stash house for smuggling cocaine when they made the discovery.
They seized cocaine, methamphetamine and heroin. Six people are being held on drug-trafficking charges.

The US Attorney’s Office for the Southern District of California said the tunnel was 61ft (18m) deep and 4ft (1m) in diameter.
Prosecutors say that before the discovery, officers saw several vehicles come and go from the property in Tijuana and the warehouse on Friday 13 May.
When officers entered the warehouse, the cross-border tunnel exit point was found carved out of the floor.

The attorney’s office said 1,762lb (799kg) of cocaine, 164lb (74kg) of methamphetamine and 3.5lb (1.5kg) of heroin had been seized.
“There is no more light at the end of this narco-tunnel,” said US Attorney Randy Grossman.
“We will take down every subterranean smuggling route we find to keep illicit drugs from reaching our streets and destroying our families and communities.”

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