Twin car bombs at a military officers\' club in southern Syria killed at least 20 soldiers on Saturday, a watchdog said. The two bombs exploded minutes apart in the back garden of the club in the city of Daraa, the Syrian Observatory for Human Rights said. State news agency SANA reported that two car bomb attacks had hit the city, causing casualties and significant damage, but provided no further details. A third explosion later hit another military post in the city, but did not cause any casualties, the Observatory said. The cause of the third explosion was not immediately known. Daraa province on Syria\'s southern border with Jordan is considered the cradle of the country\'s nearly 20-month uprising against the government of President Bashar al-Assad.