The Iraqi asylum seeker is seen in CCTV footage wearing a Chelsea shirt as he boarded a train to Dover – just hours after allegedly targeting rush hour commuters on the morning of September 15 last year.
The 18-year-old is accused of leaving 400g of homemade TATP and an assortment of nuts, bolts, screwdrivers and knives inside a bucket in a Lidl bag, with a timer set to cause mass destruction during a busy commuting period.
Explosives expert Sarah Wilson told jurors at the Old Bailey that just one gram of the highly sensitive TATP could cause serious harm, reminding the court that there were around 400g in the device.
Describing the carnage that could potentially have been unleashed if the device had fully detonated, she said: "400g of TATP has the potential to cause damage to property and harm or serious harm to those in closest proximity which could potentially be lethal.
"There would have been damage to the train, the infrastructure of the train, but also harm to those in closest proximity."
When asked by Prosecutor Alison Morgan if all the elements needed to make a viable explosive device were present in the bucket, Wilson replied: "Yes they were."
Wilson told jurors that TATP was a "sensitive primary high explosive" which was "very unstable" and could detonate if hit or dropped as it was carried.
She added: "The addition of shrapnel or metal items in the explosive device would increase the potential of that device to cause harm or damage.
"You have the explosive which is capable of exploding but you then have a lot of small metal fragments which could also be expelled out some distance at that event."
The court was told how Hassan confessed to making explosives when he was arrested the day after the attack.
Hassan had shrugged when he was stopped by officers at the Port of Dover and asked if he had seen the news.
Questioned about who made the bomb in an emergency safety interview, Hassan replied: “I did."
The media studies pupil had allegedly used a "student of the year" prize to buy a key ingredient for the explosive device on Amazon, which he then knocked together in the kitchen of his foster home.
When asked if there were any more bombs, he said there "may be a few milligrams, traces, at my home address".
Cops confirmed to the court that traces of the highly sensitive explosive were found in the kitchen of the Sunbury property, including on the hob, sink and extractor fan.
Officers inspecting the home seized a box of nuts, bolts and screwdrivers, as well as three tubes of fake blood and a blue vase.
A homemade video found on a USB stick shows the destruction of a mobile phone in various different ways, including baking in the oven, battering with a child's toy and flushing down the toilet.
The prosecution has alleged the film, which was apparently made for Hassan's media course, was "consistent" with his attempts to get rid of his mobile after the attack.
Hassan denies attempted murder and using the chemical compound TATP to cause an explosion that was likely to endanger life.
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