( CNN ) -- Interpol said Thursday it issued a `` red notice '' for Samantha Lewthwaite , the so-called `` White Widow , '' at the request of Kenyan authorities , but the international police agency added that the notice dealt with a 2011 incident . Reports that a white woman was among the terrorists who stormed a mall in Nairobi last weekend have prompted a slew of media speculation about Lewthwaite , a British woman whose husband was one of the suicide bombers in the 2005 London terror attacks . Known as the `` White Widow , '' Lewthwaite , 29 , has been wanted by international counterterrorism officials since authorities found bomb-making materials in her Mombasa , Kenya , apartment in 2011 . She vanished shortly before a raid . The red notice is for charges related to the explosives , not the Westgate Mall attack , Interpol said . Red notices issued by Interpol alert law enforcement around the world that a person is wanted , but they are not international arrest warrants . `` By requesting an Interpol Red Notice , Kenya has activated a global 'tripwire ' for this fugitive , '' said Interpol Secretary General Ronald K. Noble . `` 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 , '' he said . Witnesses said they saw a female militant inside the mall during the attack . And a senior Kenyan official confirmed Tuesday that a woman was involved . Yet another official said Wednesday that authorities ca n't say much about who the woman was or what she was doing . Al-Shabaab gunmen stormed the Westgate mall Saturday . At least 67 people were killed and as many as 63 people are still unaccounted for .
NEW : Witnesses say a woman was among the Nairobi mall attackers . Interpol Red Notice asks for help finding Ronald K. Noble , dubbed the `` White Widow '' Interpol says the notice relates to 2005 explosives charges . Witnesses say they saw an unidentified woman among the Kenya attackers .