That used to be the fingerprints of Al Queda. They liked to show they could coordinate multiple attacks at different locations.
Although we have two names that indicates an origin, we shall not exclude that it could have been coordinated by a state actor and that the perpetrators had no clue about that.
Earlier today I heard 3 churches and 3 hotels, then a little later, they were still having explosions, up to 9 locations and that was before 6 pm Sunday.