Paris knife attacker injures seven but BBC News spin furiously

This BBC report https://www.bbc.co.uk/news/world-europe-45468082 begins:

'Seven people have been injured, four seriously, in an attack by a man armed with a knife and an iron bar in the French capital, Paris, police say.

The man, said to be an Afghan national, was arrested. Sources said there was no indication it was a terrorist attack.'

What sources?

'No indication'?