At the Redlands home that Farook and Malike were renting, police found about 12 pipe bombs. The explosive device found at the scene of the shooting conisted of three pipe bombs attached to a remote control vehicle. It apparently did not detonate during the shooting.

After the shootout between the suspects and police, they found more than 1,500 rounds of ammunition on the couple or in their vehicle for the four guns they owned.

The SUV they were driving had been rented locally several days before the shooting.

The third person they detained turned out to be unconnected to the shootings. There are no other suspects they believe were directly involved with the shooting itself.

The guns involved were all purchased legally. The handguns were purchased directly by Farook. The rifles were not, and the origins of the rifles are still being researched.

Farook had no criminal record to the police's knowledge and was not subject to any current investigations.

Farook did travel overseas in July 2014 and returned with Malik. Malik is from Pakistan, in the U.S. on a Visa.

Officials plan to start releasing the names of those killed today.

Police say the couple was wearing tactical clothing, but not body armor. And despite some media reports, they found no evidence they were wearing video cameras.