Negotiators Plan to Extend Iran Nuclear Talks by 7 Months

Hours away from a Monday deadline for completing a new accord to curb Iran’s nuclear program, negotiators planned to extend talks for another seven months, a Western diplomat said.

The British foreign secretary, Philip Hammond, told reporters that “some significant progress” had been made but did not provide details. He confirmed that the goal was to reach a “headline” agreement by March 1 and that the talks would continue through June.

The negotiations are to resume next month. The location for the December talks has yet to be announced, but...