Police have detained a teenager who may be connected with a knife attack in which a man killed three people and wounded eight others in the western German city of Solingen, but the perpetrator was still at large on Saturday.

Hendrik Wuest, premier of the state of North Rhine-Westphalia, described Friday evening’s attack during a festival in the city as an act of terror.

Police were conducting a manhunt for the assailant. They said they had detained a 15-year-old and were investigating whether this person was linked to the attacker.

“This attack has struck at the heart of our country,” Wuest told reporters.

Interior minister Nancy Faeser said authorities were doing all they could to catch the assailant.

The attack took place in the Fronhof, a market square in Solingen where live bands were playing as part of a festival marking the city’s 650th anniversary.

Markus Caspers, an official with the public prosecutor’s office in Duesseldorf, said authorities were treating the attack as a possible terrorist incident because there was no other known motive and the victims seemed unrelated.

Officials have declined to speculate on what type of motive might be behind the attack.

It was claimed on Saturday by the Islamic State group as “revenge for Muslims in Palestine and everywhere”. In a statement on Telegram, IS’s Amaq news agency said that “the perpetrator of the attack on a gathering of Christians in the city of Solingen in Germany on Saturday was a soldier of the Islamic State” group.

A police official, Thorsten Fleiss, said the assailant appeared to aim for his victims’ throats.

“The perpetrator must be quickly caught and punished to the fullest extent of the law,” Chancellor Olaf Scholz said in a post on X.

Police cordoned off the square on Saturday and passers-by placed candles and flowers outside the barriers.

“We are full of shock and grief,” Solingen Mayor Tim-Oliver Kurzbach told journalists.

A German musician who goes by the name Topic said he was playing on a nearby stage when the incident occurred. He was told about what had happened but was asked to keep playing “to avoid causing a mass panic attack”, he posted on Instagram.

He was eventually told to stop, and “since the attacker was still on the run, we hid in a nearby store while police helicopters circled above us,” Topic wrote.

Authorities cancelled the remainder of the weekend festival.

Fatal stabbings and shootings are relatively rare in Germany. The government said earlier this month it wanted to toughen rules on knives that can be carried in public by reducing the maximum length allowed.

In June, a 29-year-old policeman was fatally stabbed in Mannheim during an attack on a right-wing demonstration. A stabbing attack on a train in 2021 injured several people.

North Rhine-Westphalia’s interior minister, Herbert Reul, visited the scene in Solingen early on Saturday. He told reporters it was a targeted attack on human life.

Solingen, well known for its knife manufacturing industry, is a city of some 165,000 people.

The episode comes ahead of three state elections next month in Thuringia, Saxony and Brandenburg, in which the anti-immigrant far-right Alternative for Germany (AfD) has a chance of winning.

Though the motive and identity of the assailant were not known, a top AfD candidate for one of the state elections, Bjoern Hoecke, seized on Friday’s attack, posting on X: “Do you really want to get used to this? Free yourselves and end this insanity of forced multiculturalism”.

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