Clashes at a prison in central Yemen have led to the escape of around 1,200 prisoners, Reuters have reported.
Officials from the prison told the news agency that several Al Qaeda suspects are among the escapees.
At least 30 people are dead after four car bombs exploded in the Yemeni capital Sanaa.
Many more were injured, according to security officials.
The bombs hit three mosques and the political headquarters of the Shia Houthi movement. There may have been a fifth bomb according to AFP.
Yemen has been in turmoil since September after it was taken over by Houthi rebels forcing the president Mansour Abdrabbuh to resign and flee to Saudi Arabia.
A coalition of Arab states headed by Saudi Arabia has been bombing Houthis strongholds.
Saudi Arabia shot down a Scud missile fired into the kingdom by Yemen's dominant Houthi group and its army allies, according to the Saudi state news agency, reports Reuters.
In a statement from the leadership of the Saudi-led joint Arab military coalition, Saudi Arabia said the attack by forces loyal to President Saleh happened in the early hours of the morning.
"At 2:45 on Saturday morning, the Houthi militias and ousted (President) Ali Abdullah Saleh launched a Scud missile in the direction of Khamees al-Mushait, and praise be to God, the Royal Saudi air defences blocked it with a Patriot missile," the statement said.
Saudi-led coalition airstrikes targeting Shiite rebels in Yemen resumed in the southern port city of Aden after a five-day truce came to a close.
The strikes followed talks on the war-torn country's future that were boycotted by the rebels.
A spokesperson for the Yemeni army allied with Houthi fighters said that Yemen has accepted a five-day truce proposed by Saudi Arabia, Reuters reports.
"We announce our acceptance of the humanitarian ceasefire that will begin on Tuesday," Colonel Sharaf Luqman said in a statement on Yemen's Saba news agency.
Luqman said the army would respond to any break of the ceasefire by al-Qaeda or those allied to them.
Saudi-led coalition forces have ended their month-long bombing campaign in Yemen, it was announced today.
The alliance has achieved its military goals in Yemen through the "Storms of Resolve" campaign and will bring a new operation called "Restoring Hope", a statement read on Saudi-owned Arabiya TV said.
The mission, the statement said, would focus on security at home and counter-terrorism, aid and a political solution in Yemen.
Yesterday, Saudi-led forces, that pounded the Iran-allied Houthi rebels for more than three weeks, caused a massive explosion when it targeted a weapons warehouse in Sanaa.
The US Navy has sent two warships to Yemen waters but say that there is "no specific mission" to intercept Iranian arms.
Aircraft carrier USS Theodore Roosevelt and guided-missile cruiser USS Normandy moved into the Arabian Sea yesterday to conduct maritime security operations, a Pentagon spokesman said.
The spokesman, Army Colonel Steve Warren, denied reports that the ships were on a mission to intercept Iranian arms shipments.
A Saudi airstrike causes a massive explosion destroying entire buildings and killing civilians near Yemen's capital Sanaa.Read the full story ›
An Oxfam warehouse in northern Yemen was targeted by Saudi-led coalition airstrikes on Saturday, the charity has claimed.
The organisation said the alleged attack on a storage facility in Saada was an "absolute outrage" and claimed it had shared "detailed information" with the coalition about the location of its facilities in the country.
Oxfam said no-one was killed, but the building did contain humanitarian supplies that were helping to bring clean water to people in the region.
Grace Omner, Oxfam country director in Yemen, said: "The contents of the warehouse had no military value. It only contained humanitarian supplies associated with our previous work in Saada, bringing clean water to thousands of households."
Oxfam claims that more than 100,000 Yemenis have fled since conflict in the country began three weeks ago, and has called for a negotiated peace to allow humanitarian access to affected parts of the country.
Update: Oxfam has since clarified it had not shared information about its facilities with the coalition.
United Nations Secretary-General Ban Ki-moon has called for an immediate ceasefire in Yemen, the first time he has made such an appeal since Saudi-led air strikes against Houthi rebels began three weeks ago.
In a speech to the National Press Club in Washington.Mr Ban said: "I am calling for an immediate ceasefire in Yemen by all the parties.
"The Saudis have assured me that they understand that there must be a political process. I call on all Yemenis to participate in good faith."