A forensic team of Dhaka Medical College Hospital (DMCH) on Wednesday collected fresh blood samples of July 1 Gulshan cafe attackers to ascertain if they took any stimulant or drug before carrying out the carnage.
The doctors collected the samples from Dhaka's Combined Military Hospital, where the bodies are being kept.
"We collected blood and hair samples from six bodies kept there," the Daily Star.assistant professor of forensic and medicine department at Dhaka Medical College Hospital, Dr. Sohel Mahmud as saying.
This is the second time authorities have collected blood sample of the assailants following a request of the special Counter Terrorism and Transnational Crime Unit.
Bangladesh on July 1, witnessed one of the worst terror attacks in its history after gunmen attacked Holey Artisan Bakery, an upscale eatery on Gulshan area killing 20 people after a 12-hour long siege.