ZURICH (Reuters) - Swiss authorities confirmed on Wednesday that two men arrested near Zurich were “obviously friends” of a gunman who killed four people in a shooting rampage in Vienna and said police were investigating the full extent of their relationship with him.Austrian police shot dead the gunman soon after he opened fire on Monday night on crowded bars in the city centre. They identified him as Kujtim Fejzulai, 20, a convicted jihadist who had dual Austrian and North Macedonian nationality. Swiss police arrested two men, aged 18 and 24, on Tuesday in the town of Winterthur, which has become a focus of concern about Islamist radicalism in recent years. Austrian police have arrested 14 people as they try to establish whether Fejzulai had any accomplices. Swiss Justice Minister Karin Keller-Sutter, in a panel discussion shown on the St. Galler Tagblatt newspaper’s website, said the two arrested men were “obviously friends” of the gunman. She said they had met “in person” but did not say when. “The suspect in Vienna and the two men who were arrested in Winterthur knew each other,” a spokesman for Keller-Sutter’s ministry told Reuters in an email on Wednesday. “Authorities are investigating in close coordination the nature of their relationship.” Both men, whose names have not been released, are already the subject of two criminal cases being prosecuted by the Swiss attorney general’s office (OAG) and which were opened in 2018 and 2019, the Swiss attorney general’s told Reuters in an email. The older man is a suspect in one of those cases.