US intercepts multiple shipments of Iranian weapons going to Houthis in Yemen

Peter Bergen wrote for CNN about U.S. interception of  Iranian weapons shipment to Houthis. 

Admiral Kevin Donegan, who is in charge of American naval operations in the Middle East.
The first intercepted shipment was in April 2015 and since then, American ships have intercepted an additional four shipments, Donegan said.
The shipments included thousands of AK-47 automatic rifles, as well as anti-tank missiles and sniper rifles.
The US Navy determined that the ships carrying the weapons came from Iran based on an examination of the GPS data on board the five vessels as well as from interrogations of their crews.