Thirteen soldiers died Sunday in an attack on a military bus in the Syrian desert, state news agency SANA said, with a war monitor blaming the Islamic State [IS] group. A “terrorist attack” with multiple weapons on Sunday afternoon targeted the bus, “killing 13, including officers, and wounding 18 others,” SANA reported. The Syrian Observatory for Human Rights, a British-based war monitor with an extensive network of sources across the country, said an Islamic State group cell carried out the attack in the Palymra desert. Attacks claimed by IS targeting Syrian soldiers are common. Despite losi…