The gadget, covered up under a couple of pants and put away in a white tub inside a Lidl pack, contained blades, screws and different things.
The bomb somewhat detonated and sent a fireball through the carriage at Parsons Green, south-west London.
The blast harmed 30 travelers.
It is asserted the Iraqi national purchased the elements for the bomb online from sites including Amazon.
Wearing a dim tracksuit, Hassan talked just to affirm his name and address.
He was captured the day after the assault at the port of Dover.
Two other men, matured 25 and 30, stay in authority regarding the examination.
A 17-year-old captured in connection to the episode has now been discharged without additionally activity.
Talking about the assault today, Metropolitan Police Commissioner Cressida Dick stated: “It could have been so much more terrible. Thank heavens no one was murdered at Parsons Green.
“It more likely than not been completely terrible for the general population in the prepare.”