The city of Nottingham has been shaken by a series of attacks which left two teenage students and another man dead.

Barnaby Webber, 19, Grace O'Malley-Kumar, 19, and a man in his 50s were fatally stabbed. Three people were hit by a van police believe was stolen from the older stabbing victim.

A suspect was Tasered by police before being arrested on suspicion of murder.

Counter-terrorism police are involved in the investigation, but no link to extremism has been confirmed.

Police said they were still in the early stages of the inquiry into the attacks, which occurred during the early hours of Tuesday, and had yet to determine an exact motive.

The BBC has been told by official sources the 31-year-old suspect was originally from West Africa but had been in the UK for "many years" and had settled status.

It is also understood the man has a history of mental health issues.

That is why at this stage, while counter-terrorism police are assisting the investigation, they are not running it.

He did not have a criminal record, they added.

Several roads in Nottingham were closed throughout the day as police combed for evidence, and armed officers were seen on the city's streets.

Nottingham City Council leader David Mellen said the city was in "shock and mourning", while the city's three MPs said the area had been "devastated" by the bloodshed.

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