Irish police reported on Friday that they had arrested a group of dissident republican suspects and an Irish-born Islam convert ahead of the next weeks visits by Queen Elizabeth and U.S. President Barack Obama.
Ireland is currently preparing for a major security operation ahead of the arrival of the Queen and Obama.
Police say they searched a house in Dublin on Thursday and arrested Khalid Kelly,44, a known supporter of bin Laden as part of an investigation into "threats to kill or cause harm".
Under Irish law he can be questioned for up to 72-hours without charge.
A number of dissident republicans have also been arrested in the Republic in recent days, ahead of the Queen’s four day visit which begins next Tuesday.
Four men were held in Youghal, County Cork on Thursday. They were questioned under anti-terror laws after ammunition was found in their car.
"Opposition to Queen Elizabeth's visit is the response of a tiny minority of people," Minister for Justice Alan Shatter told the Irish parliament.
The substantial security operation will lead to road closures, extensive traffic restrictions and there will be "periodic searches of pedestrians and vehicles" at key locations authorities warned.
Queen Elizabeth to visit Croke Park stadium