NCIS: Los Angeles Season 2 Episode 7 (NCIS: Los Angeles s02e07) with title “Anonymous” aired on Tuesday, October 26th 2010 at 09:00 pm via CBS Network.
Here is summary for NCIS: Los Angeles Season 2 Episode 7 :

After a state department employee and a plastic surgeon are murdered by a group of terrorists, the NCIS team must frantically search for the only witness who can identify the killers