The reported rape of a woman on Brighton beach marks the third alleged attack in the city in a week.
Police cordoned off a section of the beach in front of the i360 on Wednesday morning (August 5), as part of investigations into the incident, which is understood to have taken place overnight between August 4 and August 5.
Sussex Police confirmed a 28-year-old man has been arrested on suspicion of rape.
The arrest comes after two men were charged with rape in a matter of days amid investigations into separate incidents in Brighton.
Hany Mohamed, 37, a British national of no fixed address, was charged with rape and common assault after a woman reported she was raped in a flat at High Street, Brighton, between the evening of Wednesday, July 29 and Thursday, July 30.
The woman in her 30s is being supported by specialist officers as the investigation continues, police have said.
Akiyas Jameldeen, 51, a British national from Crawley, appeared in court charged with two counts of oral rape and one count of sexual assault by penetration on Tuesday, August 4, hours before the third incident.
He is charged with raping and sexually assaulting a woman at Black Rock beach on Sunday morning (August 2).
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In relation to the latest incident, a spokesman for Sussex Police said they were called after a woman in her 20s reported being raped.
The spokesman said: "Police are investigating a report of a rape of a woman in her 20s on Brighton Beach that is understood to have taken place overnight on Tuesday 4 August into Wednesday 5 August.
"The victim is receiving support from specialist trained officers.
"A 28-year-old man has been arrested on suspicion of rape and remains in custody at this time."
Anyone with information is asked to contact police online or by calling 101, quoting serial 228 of 05/08.
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