No, I had not yet seen the crime scene photos. They are not surprising as the components of the timer and the shrapnel will not "vaporize" in the blast. It will be interesting to see what form of explosive was used. My first guess was a mix of smokeless powder and a sugar/potassium nitrate mix which is often used by the Palestinians to fuel their "junkyard" rockets. Both would be low explosives but the the materials are relatively easy to obtain. Another possibility would be acetone peroxide (TATP) also known as "mother of Satan" by Islamic terrorists. It is a primary (high) explosive which may be prepared from commonly available materials but requires great care in the manufacture as it is extremely sensitive and subject to premature detonation (hence the nickname).
TATP is almost certainly a positive link to Islamic terrorists as it has been used by the "underwear" bomber, the "shoe" bomber (both unsuccessfully) and the planned destruction of multiple commercial flights. The "airplane" plot was aborted when the TATP exploded during preparation and took out the apartment the terrorists were using as a home base. Their plot was documented from their abandoned computer's hard drive. The use of a pressure cooker as a bomb casing is also a link to Islamic terrorists. All though once information becomes available on the Internet, it becomes much harder to isolate the actual transgressors.
Regards,
GtG