In this photo released by the Syrian official news agency SANA, Syrian people gather at the site after an explosion hit a university in Aleppo, Syria, Tuesday, Jan. 15, 2013. Two explosions struck the main university in the northern Syrian city of Aleppo on Tuesday, causing an unknown number of casualties, state media and anti-government activists said. There were conflicting reports as to what caused the blast at Aleppo University, which was in session Tuesday. (AP Photo/SANA)

Associated Press
In this photo released by the Syrian official news agency SANA, Syrian people gather at the site after an explosion hit a university in Aleppo, Syria, Tuesday, Jan. 15, 2013. Two explosions struck the main university in the northern Syrian city of Aleppo on Tuesday, causing an unknown number of casualties, state media and anti-government activists said. There were conflicting reports as to what caused the blast at Aleppo University, which was in session Tuesday. (AP Photo/SANA)
In this photo released by the Syrian official news agency SANA, Syrian people gather at the site after an explosion hit a university in Aleppo, Syria, Tuesday, Jan. 15, 2013. Two explosions struck the main university in the northern Syrian city of Aleppo on Tuesday, causing an unknown number of casualties, state media and anti-government activists said. There were conflicting reports as to what caused the blast at Aleppo University, which was in session Tuesday. (AP Photo/SANA)
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