Updated: 08.25
A man has been arrested on suspicion of the murder of Irish man Thomas O'Halloran in London.
The 87-year-old, who lived in the UK but was from Ennistymon in Co Clare, was stabbed while riding a mobility scooter on Tuesday afternoon.
Detectives earlier released images of a man they wanted to speak to in relation to the incident.
A 44-year-old man was arrested in the early hours of Thursday morning at an address in the Southall area of London, and remains in custody.
Mr O'Halloran was pronounced dead after police were called to reports of a man with stab wounds in the Greenford area just after 4pm on Tuesday.
Officers responded and gave emergency first aid until the arrival of the London Ambulance Service.
They believe Mr O'Halloran was stabbed, before managing to travel less than a kilometre on his mobility scooter where he flagged down a member of the public for help.
Detective Chief Inspector Jim Eastwood, who is leading the investigation, said: "I would like to thank the public for their overwhelming support following this horrific incident.
"As a result of the release of a CCTV image yesterday, an arrest has been made and this investigation is progressing at pace.
"Mr O’Halloran’s family have been updated with this development and continue to be supported by specially trained officers."
While Chief Superintendent Sean Wilson, who's in charge of policing for west London, added: "Mr O’Halloran had his life needlessly snatched away in a shocking act of unprovoked violence.
"I understand that the community will, quite rightly, be shocked and appalled by this incident as I am too.
"Mr O’Halloran was a very well known and much loved member of our community. My thoughts are with his family and friends.
"I’d like to appeal for their privacy to be respected while they come to terms with their loss."
Anyone with footage of the incident can upload it using this online form.
