Dzhokhar Tsarnaev deleted an Instagram account shortly before the Boston Marathon bombings, friends of his tell CNN. While his Twitter account has drawn significant attention from the public, investigators are paying close attention the the Instagram account, which included commentary on Chechen politics, as well as hashtags like "FreeChechenia #Jihad #Jannah #ALLAH #Jesus and #God."

Tsarnaev's comments, and just a few pictures, still live on archiving tools, including commentary on a photo of a now-deceased Chechen warlord.

While the account is no longer online, traces of it still appear in Google's web cache. Instagram's terms of service makes clear to users that the company will turn over information on users when given a subpoena by law enforcement officials.

The deletion of the account might be a tip to investigators that something incriminating was taken and that further evidence might turn up. Instagram cautions though that "given the volume of real-time content on Instagram, some information may only be stored for a short period of time."