An investigation has been launched after a woman was seriously assaulted in broad daylight in Dublin's St Stephen's Green.
The attack - which happened at approximately 3.30pm yesterday in the busy city centre park - was the second in the area in less than 12 hours.
A man was fighting for his life in hospital after he was allegedly assaulted in a one-punch attack near a nightclub on St Stephen's Green just after 3am on Monday.
He was being treated in the intensive care unit of Beaumont Hospital last night.
Just hours later, the woman was viciously set upon by a man inside the park.
Officers rushed to the scene and a man was arrested shortly after the attack. He was being held at Pearse Street Garda Station last night.
The woman was transferred to hospital, but the extent of her injuries is not yet known.
However, she is understood to have been subjected to a serious assault.
The area was sealed off as garda forensic officers carried out technical examinations.
Gardaí were seen removing several bags of evidence, one of which was a sports bag containing a number of items including a sleeping bag.
Officers also searched the bushes near a path in the green, eventually carrying out more plastic bags containing evidence.
The scene, on the north side of St Stephen's Green, was re-opened to the public shortly after 7.30pm.
Meanwhile, after the first incident, the man was last night fighting for his life.
The 45-year-old is believed to have been punched once in the face. He fell to the ground, hitting his head against the pavement.
Emergency services were called and the man was rushed to St James's Hospital.
However, his condition worsened later yesterday morning and he was transferred to Beaumont Hospital, where he was being treated in the intensive care unit.
A source described the man's injuries as being "very worrying", adding that he had suffered serious head injuries.
"The man suffered swelling and bleeding to the brain after the attack," the source said.
"His condition deteriorated fairly rapidly early yesterday morning and so a decision was made to transfer him to Beaumont Hospital.
"It looks like it was a one-punch attack, but unfortunately the man was hit quite hard and ended up hitting his head against the pavement," the source added.
No arrests have yet been made and gardaí from Pearse Street are investigating.