Security guards at Heathrow Airport are to strike over Easter in a dispute over pay, with passengers warned they face "severe delays".
The Unite union said flights using Heathrow Airport will "experience severe delays and disruption this Easter" as the workers stage a 10-day walkout.
More than 1,400 security guards employed by Heathrow Airports Ltd (HAL), who are members of Unite, will strike after voting in favour of the industrial action.
The walkout will begin on Friday 31 March, with the final day of strike action on Sunday 9 April (Easter Sunday).
The strike action involves security guards employed at Terminal Five.
Sharon Graham, Unite general secretary, said the workers are "fundamental to [the airport's] success" and they deserve a fair pay increase.
A Heathrow spokesperson said passengers can be reassured that the airport has "contingency plans" in place which will keep the airport "open and operational despite unnecessary threats of strike action by Unite".
"Threatening to ruin people's hard-earned holidays with strike action will not improve the deal," they said.
"We want to do the right thing by our people and our passengers, each day only delays this pay rise reaching Unite members' pockets."
Back in December, strike action by ground handlers at Heathrow was called off after an improved pay offer was made.
Around 400 Unite union members working for Menzies, an aviation company, planned to walk out for 72 hours until a larger pay offer was put on the table.
When asked about the fresh round of strikes, a Downing Street spokesperson said the PM is "disappointed" the action is going ahead and the government will do "everything we can" to mitigate the impact.
They added that there are no plans to change the official 10-week waiting time for passports that was introduced in 2021 to cater to a surge in demand following the pandemic.
On 1 February, Passport Office staff joined about 100,000 civil servants represented by the PCS as part of industrial action affecting 124 government departments.
About 133,000 civil servants also walked out on Wednesday in the largest day of strikes since this current wave started last year.