Britain, Germany and France have told UN officials that snapback sanctions are on the table if Iran does not sit down to negotiate over its nuclear weaponry.

The E3 letter follows months of diplomatic stalemate, particularly after a 12-day war between Iran and Israel in June.

BERLIN -- The top diplomats of Britain, France, and Germany threatened to reimpose sanctions on Iran as an end-of-the-month deadline nears for the country to resume negotiations with the West over its nuclear program and cooperation with the United Nations nuclear watchdog.

Iranian police say 21,000 people were detained during the 12-day war with Israel in June. State TV on Tuesday quoted a police spokesperson as saying citizens reported the suspects to the authorities,

"There was a 41% increase in calls by the public, which led to the arrest of 21,000 suspects during the 12-day war," police spokesperson Saeid Montazerolmahdi said. He did not say

Iran detained 21,000 people during its 12-day war with Israel in June, the regime has revealed. Iran has not previously acknowledged the scale of the mass arrests, which came amid fears that Iranian society had been infiltrated by Mossad,