Syria has closed all its land border crossings with Jordan, Jordan's state-run Petra news agency quoted a minister as saying on Monday.

The closure was from the Syrian side of the borders, Jordanian Minister of State for Communications and Media Affairs Taher Adwan said.

The minister added that the decision was related to the internal developments in Syria, expressing hope that the borders will be reopened.

Syrian army units and security forces backed with tanks and armored vehicles on Monday entered the southern town of Daraa with news about scores of casualties, pan-Arab al-Jazeera TV reported.

Daraa, which borders Jordan, has witnessed massive anti- government protests during the past five weeks as dozens of people were killed in clashes with security forces.