- Authorities release man they detained after truck hit crowd
- ISIS says it inspired attack
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Berlin (CNN)German authorities released a man and intensified their manhunt for the person who plowed a tractor-trailer truck into a crowd at a Berlin Christmas market, even as ISIS claimed Tuesday that it inspired the attack.
- Prosecutor: Forensic tests haven't confirmed man was in truck's cabin.
- Mourners pack nearby church at memorial for victims.
- Officials say several people could have been involved in the attack.
- A weapon used in the attack has not yet been found.
- Chancellor Angela Merkel visited the site where 12 people died.