New Delhi, Nov. 4 -- A routine railway journey was plunged into chaos when multiple people were stabbed aboard a train speeding through eastern England.

Two men were initially arrested over the Saturday evening attack, which left almost a dozen people injured. Police later released one of the men saying he was not involved in the attack.

Police are still working to uncover a motive, but say it doesn't appear to be an act of terrorism.

Here's what to know:

The train was heading for London

The train left Doncaster in northern England at 6:25 p.m., bound for London's King's Cross station. It was about halfway into its 2-hour journey and had just departed from a stop at Peterborough when police began receiving calls about people being st...