Families of San Bernardino victims file lawsuit against social media sites claiming they knowingly supported ISIS.

The inside story of the people who stopped a terrifying day from getting worse.

The petition needs 100,000 signatures in 30 days to get a White House response.

More than 13 months since the attack, some still struggle for treatment.

One year later, victims say denied medical care is adding to their suffering.

Quick-thinking citizens and fast-acting police track down the terror threat.

New evidence terrorist wife was angry over Christmas party.

Shootings are not uncommon in San Bernardino, but this was not a normal callout for first responders.

Heroic first responders put themselves on the line to stop the terror threat.

Authorities accuse the trio of participating in a marriage fraud conspiracy.

The price tag for help hacking into the iPhone used by one of the San Bernardino shooters was more than $1 million, according to FBI Director James Comey.

The FBI finally accessed an iPhone belonging to one of the San Bernardino shooters last month but the device hasn't yielded a "smoking gun."