The State Security Service [SSS] has arrested more suspects allegedly involved in the twin bomb attacks near the venue of Nigeria's 50th Independence anniversary celebration on October 1 in Abuja which claimed a dozen lives and wounded several others.

Spokeswoman for the SSS, Marilyn Ogar announced that security operatives have arrested a car dealer who is based in Amuwo Odofin in Lagos, who was also responsible for supplying the cars used for the bombing and a welder who constructed the compartments that housed the bombs in the booth of the cars.

She also announced the arrest of some suspects who allegedly carried out the March 15 bombing in Asaba, the Delta state capital and revealed that the October 1 prime suspect, Mr Henry Okah who is standing trial in South Africa was allegedly the mastermind behind the explosion.

"It has been uncovered that Henry Okah came from South Africa for the Warri bombings, purchased the cars which were then moved to the welder and later to the house of one of the suspects ... where he personally wired the bombs," Ogar told a news conference.

"Subsequently, on March 14, Okah departed the country, apparently to create an alibi for himself over the bombings that took place the next day," she said.

Ogar confirmed earlier findings by the SSS that the bill of laden for the containers containing arms which was seized in Lagos was building materials and that the cargo's destination is Nigeria.

The Security service according to Ogar has arrested two men linked with the importation of the containers; one of them being the clearing agent.

She advised Nigerians to be more security conscious in order to guard against security threats in the country.