Police are looking for a man in connection with reports of someone exposing themselves on trams on several occasions.
Nottinghamshire Police said a man is believed to have carried out "multiple acts of indecency" on two separate trams in front of groups of women and girls.
In the first incident, the man is believed to have exposed himself in front of two women on a tram in Cator Lane, Beeston, Nottinghamshire on Saturday, 7 May.
The same man then reportedly exposed himself to two girls, aged 16 and 17, at around 11.40pm on a separate tram from Toton Lane, Stapleford, to Hucknall.
He is understood to have then left the tram in High Road, Beeston, at midnight, police said.
The force has now released images of a man they want to speak to in relation to the incidents.
PC Michael Appleton, from Nottinghamshire Police, said: "This was a disturbing sequence of events that understandably left the victims in this case very upset.
"Nottinghamshire Police treats all offences of this nature extremely seriously and our investigation continues.
"We have released CCTV images of a man that we’d like to speak to about what happened, so we’d urge anyone who recognises him to get in touch with us immediately.
"Anyone with information is asked to contact Nottinghamshire Police on 101, quoting incident 90 of 9 May 2022."