ayev exchanged several text messages in the days after the bombings. those text messages served more than one purpose. the content gives investigators information but the time stamp onext messages gives them a good sense of the chronology, what time certain things were happening. >> just to review all these records from the computer the websites the text messages or whatever and the cell phones that's a time consuming ordeal. >> it certainly is. you have social media. we already knowe certain postings that may or may not have been taken down. there's a lot to look for and what we were told is they've taken a cursory review but who knows how long the rest of it takes? >> i think by all accounts they know a lot more the fbi than they're sharing with the public right now. we'll see what emerges in the coming hours and days. thanks very much joe, for that report. meanwhile, investigators have been examining whether the boston suspect tamerlan tsarnaev was influenced by a russian born