Police authorities have confirmed the incident but are yet to give the number of those affected.
警方证实发生爆炸事故，但并未透露遇难者人数。
BBC 听力 2016年2月合集
The Interior Minister, Anders Ygeman, has reportedly asked the police authorities in charge of migrants to organise the planned expulsions.
据悉内政部长伊格曼已要求负责移民事务的警察当局组织计划驱逐事宜。
813之谜（上）
The police authorities had, meanwhile, gone out of the garden; Baron Altenheim also.
与此同时，警察当局已经离开了花园；阿尔滕海姆男爵也是。
英语百科
Police authority
A police authority in the United Kingdom is a public authority that is responsible for overseeing the operations of a police force. The nature and composition of police authorities has varied over time, and there are now just four dedicated "police authorities" in the United Kingdom, although the term can refer to various similar successor bodies.