The Yemeni state news agency says an attack on a mosque north of the capital has injured more than 33 people.
The Saba news agency says the attackers locked the doors of the mosque in Amran Friday, poured fuel on worshippers, and then set the building on fire. It was not clear if the mosque was used by Sunni or Shi'ite Muslims.
The news agency says the attack was the third on a mosque in Amran. At least one person was reported arrested after the Friday attack.
Saba says three people were killed in 2001 when a man opened fired on worshippers. A bomb attack at a mosque in 2003 killed one person and injured 50.
Government forces in the Sunni-dominated country have been battling Shi'ite rebels in northern Yemen. It is not clear if Friday's attack was related to that conflict.
Some information for this report provided by Reuters and AP.