There will be no scapegoating Apple Computers. This is unrelated to San Bernardino.

This is an intelligence failure.

There is a good chance there is only one person involved. An unexploded backpack has been found. The police did explode. They may or may have not been able to obtain fingerprints or other clues to the original owner. It could have been set there to explode and didn't.

There is a suitcase used and then a suicide bomber. That could mean there is one person involved in this.