Firefighters across the UK have voted for strike action in a row over pay.
The Fire Brigades Union said while it had a mandate to take its members out on strike, it would not announce any dates until after it meets employers.
More than 80% of members who voted backed strike action across England, Scotland, Wales and Northern Ireland when they were balloted last month.
The government said the threat of strikes would be "disappointing and concerning for the public".
The union says that since 2010, its members have experienced a 12% drop in real terms earnings - equivalent to about £4,000 a year on average.
It also says that in the same period, about one in five firefighter jobs have been cut.
Of the 73% of union members who voted, 88% of staff voted to take action.
In a separate ballot, control room staff in the north-west of England also agreed to the proposed walkouts.
If the strike goes ahead, it will be the first nationwide walkout over pay in 20 years.
Matt Wrack, general secretary of the Fire Brigades Union, said firefighters were compelled to take action because "they have faced a sustained attack on pay for more than a decade".
But he said the government and local authority employers have the power to stop the strikes from happening by "making a credible offer".
"The ball is in their court," he added.
In response, Downing Street said the government would urge the FBU to "reconsider and keep negotiating".
The prime minister's official spokesman said the government was working to "mitigate the possible risks that [strike action] poses".
Members rejected a previous 5% pay offer in November, arguing it would equal a real-terms pay cut given current high rate of inflation.
Inflation measured by the Consumer Prices Index rose by 10.7% in the 12 months to November 2022.
Currently, a trainee firefighter in London can earn a salary of £28,730, including London weighting. Once they are qualified, their salary can increase to £37,032.
Outside London, trainee firefighters earn £24,191 rising to £32,244 after qualification.
