ISLAMIC State has claimed an attack in Hamburg where a 16-year-old boy was brutally stabbed to death and a girl thrown in a river was an act of one of its ‘soldiers’.

German media is reporting the incident, which happened in Hamburg earlier this month, is being referred to on Islamic State propaganda channels today as retaliation against those who are contributing to the Coalition effort in Iraq and Syria.

The claim comes the same day of another knife attack, this time upon four people in Frankfurt. Nobody is yet to claim responsibility and the attackers remain at large.

The Hamburg attacker is also yet to be identified.

The girl, aged 15, said the pair had been attacked while sitting underneath the Kennedy Bridge in Hamburg when they were attacked about 10pm on October 16. She survived the assault and managed to climb out of the river and alert police. She said the boy had been stabbed repeatedly.

media_camera A post by Islamic State propaganda arm Amaq Agency claiming the attack.

#Hamburg: the girl, who was thrown in the river, said the victim was stabbed repeatedly (@DerSPIEGEL) pic.twitter.com/ZGOCum5AQJ — I.E.N. (@GoldenKrant) October 30, 2016

Meanwhile, German police say four people have been injured in a fresh stabbing attack at a commuter rail and subway station in downtown Frankfurt.

Frankfurt police spokeswoman Chantal Ench said the attack took place early this morning Australian time, inside the Hauptwache station.

Ench says four people were taken to the hospital with stab wounds, but she didn’t have details beyond that.

She says police are investigating to find out how many people were involved

Originally published as Jihadists claim German knife attack