Police have drafted in specialist officers in their hunt for a missing man.
The man, who is in his late 50s, went missing from his Huddersfield home earlier this evening.
Police teams including a police helicopter were called in to search the Waterloo and Fenay Bridge areas.
By 9.50pm the man had not been located.
A West Yorkshire Police spokesman said the missing man had been designated as a 'high risk' missing person.
"We are still looking for this person who is considered as high risk."
The police helicopter has been hovering over the area for some time.
In a tweet at around 9.30pm, the helicopter crew said it was searching for a missing man "following a concerned call" but that he hadn't been located.