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Turkey sent batteries of ground-to-air missiles to the border with Syria on Sunday, media reports said, boosting its firepower as rebels in Syria seized several border posts. As fighting raged in Damascus and Aleppo, rebels were said to have taken control of three crossing points on the border with Turkey, which is sheltering thousands of Syrians who have fled the conflict at home. A train convoy carrying several batteries of missiles arrived in Mardin in southeastern Turkey and will be transferred to several army units deployed on the border, according to the Anatolia news agency. Television footage showed at least five vehicles in the convoy were carrying air defence missiles, in the latest show of force by Syria's one-time ally which is now a fervent critic of President Bashar al-Assad's regime. Turkish Prime Minister Recep Tayyip Erdogan warned last month after the downing of a military jet initially blamed on Damascus that it now regarded Syria as a "clear and imminent threat". Syria has in turn accused Turkey of sheltering rebels and training and supplying militants fighting the regime in a conflict that erupted in March 2011 and has now claimed at least 19000 lives according to activists. Meanwhile, Syrian rebels were now in control of the Jarabulus, Bab al-Hawa and Al-Salama posts along the nearly 900-kilometre (560-mile) frontier with Turkey, a diplomat and Anatolia said. An amateur video showed armed men celebrating the takeover of the Al-Salama post, north of <b>...</b>