A car bomb exploded on Monday in a tourist site in northeastern Yemen's province of Marib, killing at least seven people, including six Spaniards, and wounding seven others, pan-Arab satellite TV al-Jazeera reported.
The blast took place at Belkis temple, one of the most famous tourist site in Yemen, at about 6:00 p.m. (1500 GMT), the report said.
Six Spanish tourists travelling in Belkis temple were killed and seven others wounded in the blast, it added.
The 13 Spaniards were attacked when they were wrapping up the visit in the temple which was built 3,000 years ago at the time of the ancient Queen of Sheba.
No organization has claimed responsibility for the attack but security sources described the bombing as "terrorist attack", saying that Al-Qaida could be behind the attack.
Al-Qaida group in Yemen had recently issued a statement, demanding the release of fighters from Yemeni jails and threatening to carry out attacks if demands are not met.
Spanish Foreign Ministry has confirmed that six Spanish tourists were killed and seven were injured in a blast in Yemen.