"The police forces of Tehran confiscated 2.431 tons of different kinds of illicit drugs during various operations over last week," General Rahimi said.

He reiterated that four drug-trafficking gangs were dismantled while 63 major smugglers were arrested.

"Seven drug sales centers were sealed and 32 vehicles and motorcycles seized by police forces," Rahimi added.

Iran is in the forefront of the fight against drug trafficking and thousands of Iranian police forces have been so far martyred to protect the world from the danger of drugs.

The Iranian police officials maintain that drug production in Afghanistan has undergone a 40-fold increase since the US-led invasion of the country in 2001.

Afghan and western officials blame Washington and NATO for the change, saying that allies have "overlooked" the drug problem since invading the country 21 years ago.