Police investigating a series of stabbings in Birmingham have released CCTV images of a suspect.
The pictures show a man wearing a baseball cap and a dark hoodie with white drawstrings.
Chief Superintendent Steve Graham, from West Midlands Police, said officers had “worked throughout the day to trawl footage”.
Witnesses have been interviewed to “ensure we release the best possible video and image of the man we want to speak to”.
The force said extra officers had “flooded the city centre”, adding that “four scenes have been held throughout the day and forensic experts have examined each area”.
A 23-year-old man suffered fatal injuries in Irving Street, police said.
A 19-year-old man and a woman, 32, suffered critical injuries.
Another five people, aged between 23 and 33, were taken to hospital after also being hurt. Two have been discharged so far.
Mr Graham said: “At this stage we believe that the attacks were random and we have no indication of a motive.
“I would urge people to remain vigilant and report any suspicious behaviour to us.”
Anyone who recognises the man is advised not to approach him, and to call 999 immediately.
The force has a “hotline number and a dedicated web page where you can submit information, photos and videos”, Mr Graham said.
Police said earlier that they believed the stabbings were linked.
A man who witnessed one of the stabbings said he saw the attacker stab a woman “several times” in the neck.