The Iranian-backed Houthi rebels fired a Scud missile at Saudi Arabia on Thursday, in retaliation against attacks by the Saudi-led coalition, according to a Houthi-linked television station.
Saudi Arabia has not made a statement about the attack. Al Masirah TV reported that the Scud, an intense Cold War-era weapon, had been launched at an army installation close to the city of Khamees Mushait in the kingdom's southwest.
The region is home to the King Khaled Air Base, the biggest flying corps base in southern Saudi Arabia.
"The army and people's committees at dawn today fired a ballistic missile in response to the continuation of the Saudi aggression in the commission of war crimes against the Yemeni people," the source said.
The last seven months a number of missiles have been launched at Saudi Arabia by Houthi rebels, but the missiles were shot down by American-provided Patriot Missile Defence System at least twice.
Saudi Arabia set up a coalition to carry out air strikes against Houthi rebels in Yemen on March 2015, after Yemeni President, Abd Rabbu Mansour Hadi was forced by the Houthis to flee his country and go into exile in the Saudi capital Riyadh.
Southern Yemenis rally in Aden for secession
On Wednesday, thousand of southern Yemenis rallied for the secession of Yemen, which was united 24 years ago.
The protests are the first open call for secession, since the southern forces allied with the government and backed by a Saudi-led coalition pushed the rebels out of Aden and other provinces.
But now the protesters are saying that they do not want to continue the fight against the insurgents in the north and are demanding their own state.
"Taking the southerners into the war in the north cements the unity of Yemen, which we reject," was written on a banner displayed at a rally in Aden's main square of Al Arood.
During the demonstrations many protesters also carried the former flag of South Yemen.
There were two separate states in Yemen, in the north, Yemen Arab Republic and in the south, People's Democratic Republic of Yemen. Both territories were united in 1990, a civil war broke out in 1994 and it resulted in the defeat of the southern separatists.
In recent weeks, the Saudi-led coalition made advances in the east of Yemen's capital of Sanaa and captured Bab al Mandeb, which connects the Red Sea with the Gulf of Aden.