Syed Farook along with his wife Tashfeen Malik walked into a meeting and holiday party for his co-workers and started shooting.
They fired 75 shots, while also leaving behind several pipe bombs bundled together with a remote control car. Fortunately that bomb didn't go off.
They also had another dozen pipe bombs at the house and thousands of rounds of ammunition they could have used to carry out more attacks. Malik had pledged allegiance on Facebook to the Islamic State group as she and her American-born husband launched the massacre.
Joining us are Maki Haberfeld, professor of political science at John Jay College of Criminal Justice in New York City, and Tim Horner, managing director in the New York office of Kroll, a giant security company.
After two gun massacres in less than week, there is now a new national push to try to end all of these deaths by guns.
The numbers are staggering: More than 11,000 people are shot and killed in the US every year.
Rev. Al Sharpton and Spike Lee are among those calling for action to stop that violence.
Appearing with them was the mother of a young boy, murdered by senseless gun violence, who made an emotional plea. She can't save her son, but maybe she can help save someone else's.
Joining us this week is Rev. Sharpton from the National Action Network.
Finally, we discuss the week that was in politics with our analysts, Jeanne Zaino, a political science professor at Iona College and NYU, and political consultant Hank Sheinkopf.