An international arrest warrant has been issued for Northern Ireland woman Samantha Lewthwaite, who was married to one of the 7 July bombers.
Ms Lewthwaite was born in Banbridge, Co Down.
Interpol said it was issuing the "Red Notice" for the arrest of Ms Lewthwaite - dubbed the "White Widow" - at the request of the Kenyan authorities.
The warrant relates to charges of being in possession of explosives and conspiracy to commit a felony dating back to December 2011.
Interpol secretary general Ronald Noble said: "By requesting an Interpol Red Notice, Kenya has activated a global 'tripwire' for this fugitive.
"Through the Interpol Red Notice, Kenyan authorities have ensured that all 190 member countries are aware of the danger posed by this woman, not just across the region but also worldwide."
Kenya's Criminal Investigation Department said the warrant is not related to the attack by Somalia's Islamist al-Shabaab militants on the Westgate centre in Nairobi.
Director Ndegwa Muhoro said: "The red notice has nothing to do with Westgate.
"Her role in this attack is yet to be confirmed, but she is wanted on charges of possession of explosives and conspiracy to commit a felony."