Saturday’s bomb on the airport road in Damascus was a suicide attack.
A car bomb killed 17 people in the south of the city.
The early results of the investigation show that an Islamist terrorist entered Syria on Friday – the day before the attack.
He came from a neighbouring Arab country – but authorities are not saying which one. That means it could be Lebanon, Jordan or Iraq.
First thoughts will turn to Lebanon, following a report from Britain yesterday claiming that Al Qaeda extremists in Tripoli were planning to attack Syria.