Scuffles have broken out between protestors and gardaí in Dublin's O'Connell street, where former British Prime Minister Tony Blair is signing copies of his memoir.
Shoes and eggs were thrown at Mr Blair as he attended the signing, his first in Ireland.
The missiles did not hit the former prime minister as he arrived at Eason's.
Campaigners, who turned out in the pouring rain, also chanted: "Hey hey Tony hey, how many kids have you killed today?''
They also shouted: "Tony Blair war criminal" and "Blood on your hands".
Undercover detectives mingled with the crowds, taking names, before Mr Blair arrived at the shop at about 10.30am.
The city tram service was suspended as gardaí blocked off streets surrounding the city centre store.
Hundreds of protestors have gathered at the bookstore where Mr Blair is expected to spend around an hour signing copies of his book, 'A Journey'.
As Mr Blair remained in the shop and signed books for the hundreds who had queued since early this morning, the protest continued outside.
About 200 campaigners chanted: “Arrest the butcher Blair” and “Blair Blair Bush’s man and blood blood on their hands”.
Richard Boyd-Barrett, of the Anti-War Movement, accused Mr Blair of making blood money from the memoirs.
He said: “It really is shameful that somebody can be responsible for the death and destruction that he was responsible for in Iraq and Afghanistan and walk away without any accounting for that and become a very wealthy man off the back of it.”
Tony Blair has previously announced that all proceeds from his memoirs will be given to the Royal British Legion.