Manchester's shopping center reopening after evacuation

A major shopping center in the northern English city of Manchester is reopening after it was temporarily evacuated, a witness said.

Police had begun removing the cordon and workers were slowly being allowed back into site, Reuters reported.

Earlier on Tuesday a separate Reuters witness reported scores of people running from the Arndale shopping center, with some saying they had heard a big bang.

The blast occurred at the Manchester Arena at 10.35 p.m. local time on Monday shortly after a concert of US pop singer Ariana Grande. An explosive device went off outside the concert hall. Police are treating the incident as a terror attack. According to the latest data, 22 people, including children, were killed and another 59 people were wounded.