The Police Service of Northern Ireland confirmed in a statement its detectives received permission at a closed-door hearing with a judge to detain Adams for up to two more days.
Had the request been refused, Adams would have had to be charged or released by today, two days after his arrest as a suspect in the 1972 abduction, slaying and secret burial of Jean McConville, a Belfast mother of 10. The new deadline is Sunday night, although this too could be extended with judicial permission.
Deputy First Minister Martin McGuinness, the Sinn Fein official who governs Northern Ireland alongside British Protestant politicians, said his party would review its 2007 vote to recognise the legitimacy of Northern Ireland's police if Adams isn't freed without charge. Protestants required that commitment before agreeing to cooperate with Sinn Fein.
McGuinness, who like Adams reputedly was an IRA commander for three decades, said Sinn Fein would "continue to support the reformers within policing" if Adams was freed.
Moderate politicians criticized Sinn Fein for making unreasonable threats.
The justice minister in Northern Ireland's five-party government, David Ford, told journalists outside the police station where Adams is being held that detectives were just doing their jobs in investigating one of the most heinous crimes of the four-decade conflict. Without specifying any of his government colleagues, Ford said some were seeking to promote instability.