RIYADH (AFP/Reuters) - Saudi Arabia has broken up three cells of Al-Qaeda militants that were planning attacks in the kingdom, including on its security and oil installations, the Interior Ministry said on Wednesday. One cell consisted of 101 people, and two smaller cells were made up of six men each. The large cell comprised 47 Saudis and 51 Yemenis, as well as a Somali, a Bangladeshi and an Eritrean, said a statement read out on state television. The two smaller groups were made up of 11 Saudis and a Yemeni. Arms, ammunition, computers, pre-paid telephone cards and unspecified documents were all seized in the operation. The large cell was discovered as the result of an investigation launched after suspected Al-Qaeda militants - two of them dressed as women - tried to infiltrate the country in October with explosives. The two were killed in a shootout at the border and a third was arrested. The foreigners in the cell were said to have entered the country under cover of seeking work or visiting Muslim holy sites in Makkah and Madina. Two members of that cell were said to have been preparing suicide attacks, while the others were to have targeted economic and security targets. Each of the two small cells was operating without knowledge of the other, and both were said to be linked to Yemen-based Al-Qaeda in the Arabian Peninsula (AQAP) and tasked with targeting oil installations. The Ministry did not say where or when the arrests took place. We seized belts of explosives which they were planning to use in suicide attacks, one security official said. Saudi officials say they have broken up several plots inside the kingdom in the past year, rounding up numerous suspected militants and seizing weapons caches and bomb-making equipment, all linked to Al-Qaeda. In August, an AQAP militant, pretending to surrender to the authorities, sneaked a bomb into the palace of Deputy Interior Minister Prince Mohammed bin Nayef in an attempt to kill the top security official. Earlier this month, Saudi King Abdullah said the kingdom is determined to halt extremism. In domestic policy, the govt continues to expend its efforts to strengthen security, he said in his annual speech to the Shura Council, the countrys consultative assembly. A special effort has been made to confront the thinking of the group of deviants, extremists and terrorists, he said, using language the government usually employs to identify Al-Qaeda. The security services have had repeated successes with preventative actions, and will continue their activities to foil the terrorist plots, eradicate the deviant groups, and dry up the sources of terrorism, he said.