A Catholic priest has been killed and four others injured in a knife attack at an abbey in Jarosław, a town in south-east Poland, with a 31-year-old Ukrainian man arrested in connection with the assault. Reports indicate the attacker first stabbed a priest at a nearby café before entering the abbey grounds and wounding four more people. Both Polish President Karol Nawrocki and Ukrainian President Volodymyr Zelensky condemned the attack, with Polish Prime Minister Donald Tusk vowing the perpetrator "will be punished with the full severity of Polish law" as police investigate the motive. The incident is particularly sensitive given rising tensions between Polish citizens and the large number of Ukrainians who have sought refuge in Poland since Russia's full-scale invasion of Ukraine.