WikiLeaks has raised concern after Arjen Kamphuis, an associate of founder Julian Assange, went missing in Norway. The cybersecurity expert was last seen in northern Norway on August 20.

The internet transparency entity WikiLeaks tweeted on Sunday about Arjen Kamphuis' "strange disappearance," saying he has been missing since August 20, when he left his hotel in the northern Norwegian town of Bodo.

WikiLeaks said that Kamphuis, an associate of founder Julian Assange, had a ticket for a flight departing on August 22 from Trondheim, which is over 700 kilometers (435 miles) south of Bodo.

"The train between the two takes (approximately) 10 hours," suggesting he disappeared either in Bodo, Trondheim or on the train, WikiLeaks said.

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