The British Medical Association (BMA), which represents nearly 200,000 doctors in Britain, said junior doctors would walk out from 0700 GMT on Dec. 20 until 0700 GMT on Dec. 23, and then again from 0700 GMT on Jan. 3 until 0700 GMT on Jan. 9.

"We have been clear from the outset of these talks that we needed to move at pace and if we did not have a credible offer, we would be forced to call strikes," BMA junior doctors committee co-chairs Robert Laurenson and Vivek Trivedi said.

"Even though the approach was more constructive, there was not enough on offer to shape a credible deal, which we hoped would end the dispute."

The BMA said the government had offered an additional 3%, unevenly spread across doctors' grades, which it argued would still amount to pay cuts for many doctors this year.

Last month the government reached a deal with medical unions which could see an end to strike action by senior doctors, known as consultants, in England.

The BMA said that offer, which will be put to a vote over the coming weeks, would see some doctors would receive an additional uplift of as much as 12.8%.

(Reporting by Kylie MacLellan; editing by Sarah Young and Alistair Smout)