Germany
He was watched for 6 months.
And there's a huge reward for information.
Prosecutors say witnesses lost track of truck driver.
'We are all Berliners tonight.'
Driver believed to be arrested while co-driver died on the spot.
Johan Franklin says 'many Germans are just scared shitless'.
It's a 'considerable psychological challenge'.
'We have to assume that he is dangerous.'
He just wanted to go to Italy on a walking holiday.
Police sealed off the area.