A Polish builder who killed six people, including his wife and children, on the British Channel Island of Jersey has been sentenced to 30 years in prison.

Damian Rzeszowski, 31, carried out the knife attack in August 2011 at his home. He was said to have become depressed after his wife admitted to an affair.

Rzeszowski was convicted of six counts of manslaughter but cleared of murder. On Monday, Judge Michael Birt sentenced him to 30 years in jail for each victim, but the sentences are to run concurrently.

Rzeszowski's victims were his wife Izabela Rzeszowska, 30; 5-year-old daughter, Kinga; 2-year-old son, Kacper; father-in-law, Marek Gartska, 56; his wife's friend Marta De La Haye, 34; and her 5-year-old daughter, Julia.