Germany set to investigate warnings over Magdeburg attacker
德国将调查当局对马格德堡圣诞市场袭击者事先了解多少

Pledge comes after it emerged authorities received several tips over man charged with attack which killed 5 people
此前多个机构承认曾接到有关作案者阿卜杜勒莫森的警告。50岁的阿卜杜勒莫森是沙特异见人士，案发前在德国生活多年并担任精神科医师。