Emergency services are responding to an apparent explosion in central Wellington.

Fire appliances are on scene at the corner of Cuba and Ghuznee streets.

A worker at the Cuba St Night 'n Day store said he had heard an "explosion", and said the
impact of it had lifted up a manhole on Cuba St.

The section of Cuba St where it occurred has pedestrian-only access.

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"It was an explosion ... a big bang underground," he said.

It was not known if anyone was injured.