Forensic police search the Manchester Arena in Manchester, Britain May 23, 2017.[Photo/Agencies]

Xi expressed deep remorse for those who lost their lives and offered sympathy for the relatives of those who were killed or injured, according to China Central Television.

At this difficult moment, the Chinese people firmly stand by the British people, Xi said.

At least?22 people were killed and over?59 injured in what British Prime Minister Theresa May said was being treated by police as a major terrorist attack.