Investigation under way after explosion in central Oslo

A teenager has reportedly been arrested after an explosion in central Oslo.

Norwegian media said the suspect was 13 years old.

There was a controlled detonation of a second explosive device found on the site, Norwegian police said.

No injuries were reported at the scene, located near a university campus and 500 metres from the Israeli embassy.

In an unusual move, authorities sent an emergency message to Oslo residents’ mobile phones, warning them about the blast.

The second device appeared to be a “military-style” hand grenade, said the police officer in charge, Brian Skotnes.

“We’ve apprehended one suspect and are intensively seeking more information as well as other people,” Skotnes said.

“Our hypothesis is that it is criminals who have an agenda against other criminals, but we cannot rule out anything.”

The area was now safe, he added.

The incident comes nearly a day after reports of drone sightings near Oslo’s and Copenhagen’s airports.

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