A man has been killed in a shooting at a weigh-in for a World Boxing Organization (WBO) title fight in the Republic of Ireland.Two other men were injured in the incident at Dublin's Regency Hotel Friday. It is understood the gunmen were dressed as police officers and armed with AK47 assault rifles. Police investigating the suspected gangland crime have sealed off the hotel for a forensic examination. Police said, three men were shot in the attack and all were taken to hospital where one of them, a man in his 30s, subsequently died. Irish Police believe that at least four people were involved in the incident. A full investigation is under way and appealed for anyone who was at the hotel to contact police.The event was ahead tonight's European lightweight bout between Jamie Kavanagh and Antonio Joao Bento.