The first bombing was in August 2003 with two explosions an hour apart on the campus of a biotechnology company, followed by a nail bomb at a nutritional products company a month later.

The first bombing was in August 2003 with two explosions an hour apart on the campus of a biotechnology company, followed by a nail bomb at a nutritional products company a month later, the FBI said.

Less than a month later, in September 2003, a nail bomb exploded outside a nutritional products corporation based in Pleasanton, California.

In the flashback, a young version of Charlie - played by Jack Franklin - will be seen arriving to work hungover, only to find a nail bomb has exploded and the emergency department is filling up with serious casualties.

They said the man and an unnamed accomplice had in May discussed ways online to execute the attack, which would have involved the defendant ramming pedestrians in a lakeside resort in Siofok and his accomplice blowing up a nail bomb in Budapest.