Pakistan is holding a Syrian-born man with suspected terrorism links, a government official said on Thursday. The official gave no further details, including when or where the man was detained.Pakistani authorities said in November that they were trying to determine whether a man detained during a police raid in Quetta was Mustafa Setmarian Nasar, the Al Qaeda leader believed to have been the mastermind of the Madrid bombings in March 2004 and also linked to the July 7 suicide bombings in London. The train bombings in Madrid killed 192 people and the attacks in London left 56 dead. Forty-seven-year-old Nasar, who holds Spanish citizenship, has a $5 million reward on his head and has been described by the US Justice Department as a former trainer at Osama Bin LadenÂ’s camps in Afghanistan who helped teach the use of poisons and chemicals. US authorities have said that he is likely to be in Afghanistan or Pakistan. Jose-Maria Robels, SpainÂ’s ambassador to Pakistan, said on Thursday that he had no information about any such arrest. Spain sought official confirmation from Pakistan after NasarÂ’s arrest was reported by the media in November, but has yet to receive a reply, he said. In September 2003, Nasar was among 35 people named in an indictment handed down by a Spanish magistrate for terrorist activities connected to Al Qaeda.