The 23-year-old Syrian refugee believed to have killed a teenager and injured five other people in a weekend stabbing rampage in the Austrian town of Villach became radicalised quickly by using TikTok,

The case highlights the challenge of preventing so-called lone-wolf attacks, when an attacker acts without outside help.

Austrian authorities say the stabbing of six people that left a 14-year-old boy dead was carried out by a man with possible connections to the Islamic State group who appeared to have acted alone.

A 23-year-old Syrian asylum seeker suspected of stabbing five people in Villach, Austria, is believed to be a follower of Islamic State (IS), authorities said Sunday. The attack killed a 14-year-old boy and injured five others.