The attack came during the Friday prayer, killed 21 people and injured more than 100.
"No matter which organizational connections (if any) ultimately prove to be real, one thing is clear: the fountainhead of Islamic extremism that promotes and legitimizes such violence lies with the fanatical "Wahhabi" strain of Islam centered in Saudi Arabia. And if the world wants to tamp down and eliminate such violent extremism, it must confront this primary host and facilitator.
It would be troublesome but perhaps acceptable for the House of Saud to promote the intolerant and extremist Wahhabi creed just domestically. But, unfortunately, for decades the Saudis have also lavishly financed its propagation abroad. Exact numbers are not known, but it is thought that more than $100 billion have been spent on exporting fanatical Wahhabism to various much poorer Muslim nations worldwide over the past three decades. It might well be twice that number.
By comparison, the Soviets spent about $7 billion spreading communism worldwide in the 70 years from 1921 and 1991."
"Islamic State said in a statement that one of its suicide bombers, identified as Abu 'Ammar al-Najdi, carried out the attack using an explosives-laden belt that killed or wounded 250 people, U.S.-based monitoring group SITE said on its Twitter account.
It said it would not rest until Shi'ites, which the group views as heretics, were driven from the Arabian peninsula.
Saudi officials have said the group is trying hard to attack the kingdom, which as the world's top oil exporter, birthplace of Islam and champion of conservative Sunni doctrine, represents an important ally for Western countries battling Islamic State and a symbolic target for the militant group itself.
In November the Islamic State's Sunni group leader Abu Bakr al-Baghdadi called for attacks against the Sunni rulers of Saudi Arabia, which has declared Islamic State a terrorist organisation, joined international air strikes against it, and mobilised top clergy to denounce it.
Last week Baghdadi issued another speech laden with derogatory comments about the Saudi leadership and the country's Shi'ite minority.
In Beirut, Lebanon's Hezbollah, an ally of Saudi Arabia's regional rival Iran, condemned the attack but said authorities in the kingdom itself bore responsibility.
"Hezbollah holds the Saudi authorities fully responsible for this ugly crime, for its embrace and sponsorship for these criminal murderers ... to carry out similar crimes in other Arab and Muslim countries," the Shi'ite group said in a statement.
The statement appeared to echo Iranian accusations that Saudi Arabia sponsors ultra-orthodox Sunni militant groups in the region, an allegation usually taken to refer to groups such as Islamic State and al Qaeda.
Riyadh denies the allegations."
I DEEPLY REGRET SENSELESS LOSS OF LIFE IN SECTARIAN VIOLENCE ACROSS THE GLOBE.