WASHINGTON - Pakistans Inter-Services Intelligence (ISI) has set free at least two senior Afghan Taliban leaders even as it helped the United States detain the Talibans second-ranking commander in the area, The Washington Post reported Sunday. Citing unnamed US officials, the newspaper said the releases had occurred as the ISI worked with US intelligence operatives to capture Mullah Abdul Ghani Baradar and other insurgents. The quiet actions by the ISI were detected by US intelligence agencies but not publicly disclosed, the report claimed. US officials believe that ISI still supports the Taliban despite recent signals that the spy agency had started cracking down on the Islamist group, the Post said. The capture of Baradar, the Afghan Talibans second in command, seemed to signal a turning point in Pakistan, it said. But it cited unnamed US military and intelligence officials as saying the releases of Taliban militants, who were not named, are evidence that parts of Pakistans security establishment continue to support the Afghan Taliban. The officials, it said, refused to identify the Taliban figures who were released citing the secrecy surrounding US monitoring of the ISI, but said the freed captives were high-ranking Taliban members the US would want in custody. US officials, the Post said, think that Pakistan continues to pursue a hedging strategy in seeking to maintain relationships with an array of entities - including the US and Afghan governments, as well as insurgent networks - struggling to shape the outcome in Afghanistan, even as it aggressively battles the Pakistani branch of the Taliban. The ISI wants to be able to resort to the hard-power option of supporting groups that can take Kabul if the US suddenly leaves, a US military adviser was cited as saying. Pakistani intelligence officials told the Post in Islamabad the ISI was committed to dismantling insurgent groups and denied that any Taliban operatives had been released after being captured. The daily said US officials concur that the collaboration between the CIA and the ISI has improved substantially, but say they see ongoing signs that some ISI operatives are providing sanctuary and other assistance to factions of the Taliban when their CIA counterparts are not around. CIA officials, according to the Post, think that the ISIs connection to the Taliban is active. But its not clear how high that goes or who knows about it, a US counterterrorism official was quoted as saying. The Pakistanis did a sharp change of policy after 9/11, and its not certain everybody got the memo - or read it if they did.