Saudi Arabia offered a cash reward of SR5 million($1.3 million) for information leading to the arrest of sixteen people it said were involved in two deadly mosque bombings claimed by Islamic State, the Interior Ministry said on Wednesday.

The ministry also offered a 7 million riyal reward for tips that would thwart any future attacks, according to a statement published by state news agency SPA.

"Anyone dealing with the wanted men will be held accountable," the ministry warned.

A suicide bomber disguised as a woman blew himself up on Friday outside a Shi'ite Muslim mosque in the city of Dammam in eastern Saudi Arabia, killing himself and four other people.

The interior ministry identified the bomber as a Saudi citizen, 20-year old Khalid Al Wahbi Al Shemmari.

A week earlier, another suicide bomber blew himself up at a Shi'ite mosque in the nearby village of al-Qadeeh, killing 22 people.

The ministry published a list of sixteen men and their photographs on state TV, saying they were involved in the two attacks.

Islamic State, a hardline Sunni militant group based in Iraq and Syria, claimed responsibility for both attacks.-Reuters