Which of the following is INCORRECT about the explosion?

[7] Kenyan police say one person was killed and 26 injured in an explosion at a bus depot in central Nairobi. The blast hit a bus about to set off for the Ugandan capital Kampala. Last July, the Somali group al-Shabab said it was behind the blasts in the Ugandan capital which killed more than 70 people.
    The explosion happened beside a bus which was about to set off for an overnight journey from Nairobi to the Ugandan capital Kampala. Some eyewitnesses report that a bag was about to be loaded on board, but it exploded during a security check. Windows of the red bus were left smashed, and blood could be seen on the ground beside the vehicle. [8] Just hours earlier, Uganda’s police chief had warned of possible Christmas-time attacks by Somali insurgents.