Sheikh Qassem said on Friday that there were no signs of religion, wisdom, or conscience in the terrorist attack, Almanar reported.
He also urged certain Islamic countries, without naming them, to stop supporting terrorism.
On Monday night, masked gunmen stormed a mourning procession marking Ashoura, the martyrdom anniversary of Imam Hussein (PBUH), in the city of al-Dalwah in Eastern Province, and opened fire on mourners.
Seven mourners, including children, were killed in the terrorist attack.
The Saudi Arabian government claims al-Qaeda was behind the attack. Saudi Interior Ministry spokesman General Mansur al-Turki told the media on Wednesday that the attackers were “followers of the deviant ideology,” a term often used in Saudi Arabia to describe al-Qaeda.
The claim comes as there have been reports that Saudi Arabia has been supplying al-Qaeda-linked militants and other terrorist groups in Iraq and Syria with arms and money.
