Swedish police quiz Somali boy, 15, over knife murder of refugee worker as her heartbroken mother says: 'This country is no longer safe'

Chimene Mezher described her daughter Alexandra (right in left hand picture), 22, as an 'angel' devoted to helping some of the hundreds of migrant youths who have come to Sweden. Psychology graduate Alexandra - whose parents fled Lebanon more than 25 years ago - was stabbed in the back and thigh on Monday in a block of flats housing ten youths aged 14 to 17. A 15-year-old boy, described as Somalian, is reportedly being held at a youth detention centre(inset) on suspicion of murder. Her mother Chimene said: 'We left Lebanon to escape the civil war, the violence and the danger. We came to Sweden where it was safe, to start our family. But it is not safe any more.'