![Police cordon tape is seen after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)](http://www.ecns.cn/hd/2018/06/20/a5fc1d17d1444537adc93873e1646d2e.jpg)
Police cordon tape is seen after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)
![London Transport staff stand at the scene after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)](http://www.ecns.cn/hd/2018/06/20/71c5324417d24c5e8ac995d7388ec4e6.jpg)
London Transport staff stand at the scene after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)
![Police stand at the scene after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)](http://www.ecns.cn/hd/2018/06/20/ef9f4320e9b7479599083611853a09d6.jpg)
Police stand at the scene after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)
![Police attend the scene after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)](http://www.ecns.cn/hd/2018/06/20/6c93157d858b48649144880ad923247b.jpg)
Police attend the scene after several people were injured after a small explosion at Southgate Underground station in north London, Britain June 19, 2018. Five people have been injured after an explosion at a London underground station, which officials said they believed was caused by a battery short circuit. (Photo/Agencies)