Since the original story is based on a 'security sources', one of them a Malian, I would use a large "pinch of salt" and the reputable analysis in Post 122 made no reference to a Nigerian Boko Harem presence. Given the very confusing situation in Northern Mali, specifically Timbucktu, alongside the clear interests of 'security sources' to link Boko Harem to events in Mali I think I'll wait for a lot more before making a decision.

Convincing others, in particular Algeria, France, Nigeria and USA that there is a linkage is the motive.