Evidence of weapons intended for the Saudi military has been found at a base used by Syrian rebels.
A BBC correspondent in Syria has seen three small crates from an arms manufacturer addressed to Saudi Arabia at a rebel camp in the city of Aleppo.
The crates of ammunition were discovered in a mosque in Aleppo. They were made by a Ukrainian firm, Dastan, which specialises in naval weapons and missile complexes.
How the crates reached the Syrian town is unknown, and the BBC was not allowed to film their contents.
The correspondent says it is believed an increasing supply of weapons is being paid for by supporters of the Syrian rebels in the Gulf in the effort to overthrow President Bashar al-Assad.
Saudi Arabia has refused to comment on the matter.