A Briton missing in the aftermath of the Brussels attacks has not been in contact with his partner since the bombs went off and may have been on the Metro at the time.
David Dixon, who lives in Brussels but is originally from Hartlepool, County Durham, was travelling to work on Tuesday morning but did not arrive at his office.
Friends on social media have been appealing for information on his whereabouts and asking anyone with information to contact his partner Charlotte Sutcliffe.
Simon Hartley-Jones, who described himself as a "very good friend" of Mr Dixon, said he was missing and asked his followers to retweet the appeal to find him.
He tweeted a photo of Mr Dixon, who wears glasses and has been pictured with short grey hair, captioned: "He was in the metro system, he didn't arrive to his office and we still haven't reached him."
Photos of Mr Dixon, including one of him with a little boy, were also circulated on social media.
His Facebook page shows that he studied Economics at Newcastle University and used to work for British Airways.