Peru's Congress has unanimously approved legislation authorizing military planes to shoot down suspected drug flights, which police say smuggle more than a ton of cocaine to Bolivia daily.

President Ollanta Humala is expected to sign the bill into law.

Peru halted aerial interdiction after an air force pilot killed a U.S. missionary and her child in a 2001 attack on a misidentified plane.

Peru became the world's No. 1 cocaine producer in 2012 and about half the cocaine it produces travels via small planes to Bolivia.

Humala vowed to make combating trafficking a priority when he took office in 2011.

His government has eradicated a record amount of coca fields but has been criticized for seizing a relatively small amount of cocaine and leaving the "air bridge" to Bolivia undisturbed.