Intelligence has emerged suggesting the Syrian regime has moved chemical weapons to the Homs region, a source has said. A senior British intelligence official questioned about claims in the US that several streams of signal intelligence detailing the transfer of a chemical agent said they believed the account to be a "pretty accurate description" of what the UK believes is going on. Fox News reported a senior US defence source as saying it was not clear wether the movement of the agent, possibly Sarin nerve gas, had been authorised by President Bashar al Assad or local Syrian military commanders frustrated by the ongoing uprising in Homs. The agents, which may not yet have been weaponised, were moved from previously known stockpile locations, the report said. Recent investigations by Sky News identified four sites where chemical agents are produced: Hama, Latakia, Al Safira, near Aleppo and at the Centre D'Etude et Recherche Scientifique laboratories in Damascus. Storage sites were also found at Khan abu Shamat, Furqlus, Hama, Masyaf, Palmyra.