Dozens of people are dead and at least 150 others were injured after a series of suicide-bomber explosions in two mosques in Yemen, authorities told ABC News.
The attacks happened in the country's capital of Sana'a, authorities said.
A total of 120 people were killed and 150 were injured, according to the Ministry of Information in Yemen.
Two high-ranking figures were among those killed: a major Shia religious leader and the imam of one of the mosques, according to a Yemeni official.
ISIS claimed responsibility for the attacks, according to the SITE Intelligence Group, which tracks international terrorists and the global jihadist network.
Four suicide bombers attacked "two Houthis dens" in Sanaa, according to a statement from the Sana'a province media office, while a fifth attacked another "den" in Saada.
The mosques targeted are used mainly by supporters of the Zaidi Shia-led Houthi rebel movement which controls the capital, the BBC reports.