An explosion has killed at least eight people and injured 18 others during Friday prayers inside a mosque in the Syrian city of Homs, the health ministry has said.

Pictures from Syria's state-run news agency, Sana, show the inside of the Imam Ali ibn Abi Talib Mosque with black, scorched walls, smashed windows, and blood on the carpet.

Officials believe that an explosive was detonated inside the building, Sana reports, citing a security source. While authorities are still searching for the perpetrators, jihadist group Saraya Ansar al-Sunnah said it was behind the explosion.

The mosque is in the Wadi al-Dhahab neighbourhood, where most people are part of the Alawite ethnoreligious group.

Syria's Foreign Ministry condemned the terrorist crime, stating that the cowardly act is a blatant assault on human and moral values aimed at undermining the security and stability of the country.

Saraya Ansar al-Sunnah, a Sunni extremist group, claimed to have carried out the attack in collaboration with another unidentified group, using explosives planted at the site.

With vague origins, some observers speculated that Saraya Ansar al-Sunnah could be a front for the Islamic State group (IS) given similar messaging and target patterns.

The latest blast comes after months without claimed attacks from the group, which has previously focused on targeted killings of minorities and remnants of Assad's government.

This attack comes a year after Syrian rebel forces overthrew Assad, an Alawite, amidst rising sectarian violence in the country.

Since Assad's ousting, Alawites have faced reprisals and crackdowns. March saw accusations against security forces from the Syrian Observatory for Human Rights (SOHR) for killing dozens of Alawites in Latakia.

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