At least 25 people have been killed and 25 more injured, some critically, after a suicide bomber detonated his explosive vest on a bus in Syria's Idlib province, adjoining Turkey, according to a monitoring network. The Syrian Observatory for Human Rights (SOHR) said the bus was carrying opposition fighters when the blast happened near the Atmeh border crossing. Turkey's CNN Turk television citing local sources reported that the explosion occurred at the entrance of Atmeh refugee camp in Idlib late on Sunday. Turkey sent several ambulances to the scene of the attack; eight injured rebels who were in critical condition were taken to hospitals in Turkey's Hatay province. The rest are being treated in Syrian hospitals, Turkish media reported. Authorities in Hatay said in an official statement on Monday that four of the injured fighters later died in Turkish hospitals. Idlib is a major bastion of the Turkey-backed opposition to President Bashar al-Assad's rule...