Gerry Adams has apologised for using the N-word in a tweet about film Django Unchained but defended the "context and substance" of the point he was making.
The Sinn Fein president said it was "inappropriate" to have used the N-word on his Twitter account after watching the Quentin Tarantino slavery film on Sunday night.
He tweeted: "Watching Django Unchained - A Ballymurphy N*****!" Although the tweet was removed swiftly it provoked a furious reaction.
Mr Adams said he was trying to make "a parallel between the plight of people here in Ireland the struggle of people from African-American extraction".
He added that the Irish civil-rights campaign, of which he has played a major role, was based broadly on the American civil rights campaign.
The party president is a prolific Twitter user having tweeted 10,500 times to his 100,000 followers.Read the full story ›
Gerry Adams will not be prosecuted in connection with the IRA murder of Belfast mother Jean McConville, Northern Ireland prosecutors sayRead the full story ›
Sinn Féin President Gerry Adams has denied that he made any threats to Michael McConville during their past conversations.
Quoted on the party's website, Mr Adams said: “My sole purpose in meeting with Michael McConville was and is to help the family."
"I can understand the antipathy they feel toward republicans given the abduction and killing of their mother and the life they subsequently had.
"However, I made no threat against Michael McConville and neither did I warn of backlash."
There is "insufficient evidence" to pursue a prosecution against Sinn Fein leader Gerry Adams in relation to the 1972 murder of Jean McConville, reports say.
The BBC said that it understands no charges would be brought against Mr Adams unless significant new evidence comes to light, according to the Press Association.
Gerry Adams has been warned of a "credible" death threat, Sinn Fein said.
The message was passed to the PSNI by Mr Adams' wife while he was not at home.
Mr Adams, was released last night after four days of questioning about the notorious 1972 killing of Jean McConville and other alleged links with the IRA.
A 74-year-old man believed to be photographing a new mural hailing Gerry Adams as a peacemaker, has been assaulted.
The mural in the republican Falls Road area of West Belfast depicts the Sinn Fein president beside the words "peacemaker, leader, visionary" and was a response to his arrest.
The photographer suffered cuts and bruises during Sunday's attack, a Police Service of Northern Ireland (PSNI) spokesman said.
"It was reported that a 74-year-old man was taking photographs of murals when he was approached by three unknown males. The males assaulted the man and stole his camera."
Deputy First Minister Martin McGuinness launched the new mural at the weekend, which sits alongside one commemorating 1981 Maze prison IRA hunger striker Bobby Sands.
Hundreds of political paintings were created around Northern Ireland in republican and loyalist areas during the 30-year conflict.
The son of murdered Jean McConville has said Gerry Adams threatened him with a "backlash" if he released the names of those he believed were responsible.
Michael McConville has said he along with his family will continue to fight for justice after the Sinn Fein president was freed after questioning, but has maintained he could be shot if he disclosed the identities of suspects to police.
Mr Adams, 65, was released after four days of questioning about the notorious 1972 killing of the mother-of-10 and other alleged links with the IRA, he vehemently rejected the allegations.
Mr McConville told the BBC Radio 4's Today programme: "Gerry Adams says to me 'Michael, you are getting a letter of support from the republican people'. He says 'if you release the names I hope you are ready for the backlash'.
"I took it as a threat."
Northern Ireland should be wary of investigating historic cases of murder which took place during The Troubles as "they are in the past" and the public does not want "to go back to that".
Labour's Peter Hain told Good Morning Britain he did not think digging up the past would bring justice or closure to the victim's families.
"I do not think that going back 40 and more years in this fashion is actually going to take Northern Ireland forward, nor do I think, in the vast majority of unsolved cases, it will bring any sense of justice to victims."
The Government is "confident" authoritative institutions in Northern Ireland, like the police, are independent.
Speaking to Good Morning Britain, the Northern Ireland Secretary dismissed calls from the son of disappeared Jean McConville to have her murder investigated by an independent body.
Theresa Villiers explained: "I am confident that the current institutions in Northern Ireland, the police service of Northern Ireland, and other institutions are independent. They will make fair and balanced decisions on this case, as they do in all others."