At least 137 people have been killed and 345 wounded in suicide attacks on Yemen mosques, according to a Shiite TV channel.

Four suicide bombers hit a pair of mosques controlled by Shiite rebels in the capital Sanaa, unleashing blasts through crowds of worshippers, according to medical officials.

The bombers attacked the Badr and al-Hashoosh mosques, located across town from each other, during midday Friday prayers, the most crowded time of the week, according to the state news agency.

While both mosques are controlled by Shiite rebels, known as Houthis, they are frequented by Sunni worshippers as well.

There was no immediate claim of responsibility, but the Houthis are sworn enemies of Yemen's powerful al Qaida branch, which is regarded by the West as the world's most dangerous and active al Qaida affiliate.

Supporters of the rival Islamic State affiliate in Yemen praised the attack on Twitter.

The rebel-owned Al-Masirah TV channel said hospitals were urging citizens to donate blood. It also reported that a fifth suicide bomb attack on another mosque was foiled in the northern city of Saada, a Houthi stronghold.

Two suicide bombers attacked the Badr mosque. The first was caught by militia guards searching worshippers at the entrance and detonated his device at the outside gates. Amid the ensuing panic, a second bomber entered the mosque and blow himself up amid the crowds, according to the official news agency SABA.

Survivors compared the explosions to an earthquake, and said some of those who survived the original blasts were then injured by shattered glass falling from the mosque's large hanging chandeliers.

Another pair of suicide bombers attacked the al-Hashoosh mosque, according to the state news agency. One witness from that attack said he was thrown two metres by one of the blasts.

"The heads, legs and arms of the dead people were scattered on the floor of the mosque," Mohammed al-Ansi said, adding: "Blood was running like a river."

The television channel aired footage from inside the al-Hashoosh mosque, where screaming volunteers were using blankets to carry away victims. The dead included a small child, and corpses were lined up on the mosque floor and carried away in pick-up trucks.