Police in the Nigerian state of Lagos announced the arrest of Charles Okah and his children in possible connection to an Oct. 1 blast in Abuja where celebrants were marking the country's 50th day of independence, Nigeria's NEXT newspaper reports.
Nine people were arrested in connection to the blasts, including former MEND leader Henry Okah, who denied responsibility for the attack. Twelve people were killed in the bombing.
Okah during his trial in South Africa said his brother Charles "has faked my voice" on a series of MEND communications.
The MEND leader, one of nine people arrested in the aftermath of the bombings, accuses Nigeria President Goodluck Jonathan of trying to gain politically from the attacks.
Henry Okah, currently detained in South Africa, told al-Jazeera that he was contacted by a high-level aide to Jonathan in the wake of the bombing to inform him that the president wanted him to contact MEND officials and persuade them to retract their statement claiming responsibility for the attacks.