Nigeria’s President Muhammadu Buhari has ordered the arrest of a former government official and others accused of stealing over $2 billion intended to fund the fight against the Islamist extremist group Boko Haram.

Sambo Dasuki, the national security adviser to the previous president Goodluck Jonathan, is accused of awarding fictitious contracts to buy four fighter jets, 12 helicopters and ammunition.

Buhari said if the funds had been properly used,”thousands of needless Nigerian deaths would have been avoided.” Dasuki, a retired army colonel, denies the accusations.

The development came as 32 people were killed and 80 wounded in an explosion at a market in the northeastern city of Yola on Tuesday.

Nobody immediately claimed responsibility, but the incident bears the hallmarks of Boko Haram, which is attempting to create an Islamic caliphate in Nigeria.

The explosion broke a three-week hiatus in bombings after a series of suicide attacks culminated in twin blasts in mosques in two cities in the northeast that killed 42 people and wounded more than 100 on Oct. 23.

Facebook activated its “Safety Check” feature following Tuesday’s blast, after users said it seemed that deaths elsewhere didn’t matter as much as the deaths in Paris. The social networking site activated the feature for a terrorist attack for the first time after Friday’s attacks in the French capital, when 129 people were killed by Islamic State militants, but failed to activate it when more than 40 people were killed in suicide bombings in Beirut on Thursday, also claimed by the extremists, known as ISIS or ISIL.

The safety check allows people to inform their friends they are safe during disasters and check the status of others.

In a post on his Facebook page, CEO Mark Zuckerberg said: “After the Paris attacks last week, we made the decision to use Safety Check for more tragic events like this going forward. We’re now working quickly to develop criteria for the new policy and determine when and how this service can be most useful.

“Unfortunately, these kinds of events are all too common, so I won’t post about all of them. A loss of human life anywhere is a tragedy, and we’re committed to doing our part to help people in more of these situations.”