One year ago today, on September 15, 2017, at just past 0800 local time, a bomb exploded at London’s Parsons Green Underground train station. The blast injured thirty people. 18-year-old Ahmed Hassan was arrested the next day at the Port of Dover. Hassan, an Iraqi, arrived in the United Kingdom illegally in October 2015.

Although the bombing was claimed by Daesh (ISIS), Amber Rudd, British Home Secretary, stated there was no evidence supporting the terrorist group’s claim. The London Metropolitan Police added that the claim was “very routine in these sort of circumstances”.

The bomb itself was described as being a crudely assembled homemade bucket bomb containing the explosive chemical triacetone triperoxide (TATP). The crudeness of its construction is evident in the fact that it only partially exploded.

The bomb was in a plastic bucket in a shopping bag. Some reports stated the explosive had a timer attached and that wires were hanging out.