SANAA, July 29 (Xinhua) -- Yemen's Houthi rebels on Monday night vowed to retaliate against a deadly airstrike allegedly launched by the Saudi-led coalition on a popular market.

Residents and medical sources in the Yemeni northern province of Saada said earlier that a Saudi-led coalition airstrike hit a market in Katabir district on Monday evening, killing at least 13 and injuring more than 20 others including children.

Houthis "will not stand idly by toward the aggressor's crimes against the Yemeni people," the Houthi military spokesman Yahya Sarea said in a statement carried by the group-controlled Saba news agency.

There were no comments from Saudi Arabia or the coalition on the alleged airstrike.

The airstrike came just a few hours after the Yemeni Houthi rebels claimed responsibility for a ballistic missile in the southwestern Saudi city of Asir.

Houthis have recently stepped up missile and drone attacks on Saudi Arabia, but most of the missiles and drones were intercepted and destroyed by the kingdom's air forces.

Saudi Arabia has been leading an Arab military coalition against Iran-allied Houthis in Yemen for more than four years in support of the exiled internationally-recognized government of Yemeni President Abd-Rabbu Mansour Hadi.