TEHRAN, Iran (AP) – Iran’s state-run radio on Monday cited what it called “positive changes” in Britain’s negotiating stance and said because of those, television stations would not broadcast additional videos of British sailors’ confessions.

The state-run radio did not detail what it meant by positive changes, nor quote any officials by name. A state-run TV station had said earlier Monday that all 15 British sailors and marines held captive by the country had confessed to illegally entering Iranian waters.

The 15 Britons were detained by Iranian naval units on March 23 while patrolling for smugglers as part of a U.N.-mandated force monitoring the Persian Gulf. They were seized by Iranian naval units near the mouth of the Shatt al-Arab, a waterway that has long been a disputed dividing line between Iraq and Iran.

Iran has repeatedly said it was trying to determine the intent of the British personnel before deciding what to do with them, and has demanded an apology from Britain as a condition for their release.

Britain contends the sailors were in Iraqi waters and has said it would not apologize.

The Iran Broadcasting Company said Monday the 15 alleged confessions would not be broadcast on Iranian news stations, however, due to what it called a change in the British government’s negotiating policies. The state-run agency did not provide any further details as to what it meant by that.

The British government has deplored the airing on state-run TV of four of the sailors’ confessions so far, saying they appeared to be coerced.

Iran’s ambassador to Moscow had said on Sunday the sailors’ case had entered a “legal phase,” but backtracked from earlier remarks attributed to him that the sailors could be tried.

The alleged admissions of intrusion into Iranian territorial waters are not new: Iran’s military chief had said the day after their capture that the sailors had confessed after interrogations to illegally entering Iranian waters.

Al-Alam, Iran’s Arabic-language state television station, has also broadcast video footage of four of the 15 saying they were in Iranian waters at the time of their capture. On Sunday, that footage included two of the sailors who used maps to show the alleged location where they were surrounded and seized by Iranian military vessels.

Britain says the sailors were in Iraqi waters operating under a U.N. mandate, and has released its own maps and GPS coordinates showing their locations.