Police have arrested a 53 year old man on suspicion of four counts of sexual assault.
The arrest follows incidents in Derry city and onboard a train between Derry and Ballymoney on Monday evening, April 3.
Police said two women reported being approached and sexually assaulted at their place of work.
This allegedly happened in Foyle Street at around 5.30pm.
A third woman was then reportedly approached and assaulted, also on Foyle Street, at around 6pm.
A PSNI spokesperson said there was then another report describing a similar suspect having approached and assaulted a woman onboard a train travelling between Derry and Ballymoney at around 8.15pm.
Inspector Armour said: “The suspect has been interviewed on suspicion of these offences.
“He will return for further questioning at a future date.
“We are thankful to Translink staff whose assistance made it possible for police to co-ordinate resources and arrest the suspect at the train station.”
