British special forces and Afghan troops intercepted an Iranian shipment of 48 122mm rockets and 1,000 rounds of ammunition to the Taliban. According to western diplomats, the cache would have enabled the Taliban to double the range of its attacks (to 12 miles). The rockets were discovered on February 5, 2011, when troops stopped a convoy in Nimruz Province in southwest Afghanistan. Iran's export of the weaponry violates U.N. Security Council Resolution 1747, which bars Iran from exporting conventional arms. British military officials called the shipment evidence of a significant escalation in Tehran's support for the Taliban.