Rafik Hariri was killed in a major car bomb in Beirut in 2005
A key suspect in the assassination of former Lebanese Prime Minister Rafik Hariri has been arrested in Dubai.
Mohammed Zuhair al-Siddiq, a former Syrian intelligence officer, was detained on Sunday.
Mr Siddiq was a witness to Hariri's killing, but an international arrest warrant was later issued for him.
There is widespread suspicion inside and outside Lebanon that Syria was involved in Hariri'S death in 2005, though Damascus denies this strongly.
An international court convened in The Hague in March to try the suspects in the murder of Rafik Hariri.
He was killed, along with 22 others, in a huge car bombing in February 2005 in central Beirut. His murder sparked an international outcry and eventually led to the withdrawal of the Syrian military from Lebanon in April 2005.
The court's Canadian prosecutor, Daniel Bellemare, has until the end of April to ask the Lebanese authorities for suspects to be transferred to the Special Tribunal for Lebanon.
He has said he would submit an indictment when satisfied that he had sufficient evidence.