The UK has expanded its travel warning to cover most areas along the coast of Kenya.
The Foreign and Commonwealth Office has advised people against "all but essential" travel to within 15km (nine miles) of the coast, from the Tana River down to Tiwi.
This area includes Mombasa Island, Moi International Airport, Malindi, Kilifi and Watamu, but does not cover Diani.
The warning also covers areas within 60km (37 miles) of the Kenya-Somalia border, Garissa County and the Eastleigh area of Nairobi.
There are no travel warnings against any of Kenya's popular safari destinations in the national parks, including Masai Mara, Laikipia and the Aberdare National Park.
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Kenyan police chief David Kimaiyo has stepped down in the wake of the latest al-Shabaab attack in the country.
Kimaiyo had come under fire to quit after he was criticised for failing to step up security following the militant group's attack on Nairobi's Westgate shopping mall last year which killed 67 people.
President Uhuru Kenyatta said had accepted his resignation and also confirmed he would be appointing a new interior minister in a reshuffle.
Somali militant group al-Shabaab have admitted being behind an attack on a Kenyan quarry site which killed dozens.
The group said its fighters had killed 40 people, although the government and other officials put the death toll at 36.
Village elders said at least two non-Muslims, who were attacked as they slept, were beheaded while the rest were shot at close range.
In a statement, al-Shabaab said it had executed dozens of "Kenyan crusaders" as punishment for Kenya sending troops to Somalia to fight Islamist rebels.
At least 36 quarry workers have been killed in northern Kenya in a suspected attack by al-Shabaab militants, police said.
The workers were ambushed by gunmen in Mandera County, near the border with Somalia.
Police sources claimed non-Muslims were singled out and some were shot, while others were decapitated.
No group has yet claimed responsibility but the attack.
Some 28 people were killed in the area last month when al-Shabaab militants hijacked a Nairobi-bound bus.
Kenya has warned its citizens about transiting through Heathrow Airport because of “a substantial threat of possible attack” by Al-Qaeda operatives, according to local media reports.
Hours after the British Foreign and Commonwealth Office (FCO) changed its travel advice for parts of the Kenyan coast following a spate of attacks that have left at least 87 people dead, the African nation's Foreign Affairs Principal Secretary issued the warning.
Karanja Kibicho told the Daily Nation newspaper: “According to information provided by US officials, Al Qaeda operatives in Yemen and Syria were developing sophisticated bombs that could bring down a plane."
He added: "The information states that Britain would be the most likely country to be affected. Based on this information, Kenyans are advised not to travel through London Heathrow where there is substantial threat of a possible attack.
The Foreign and Commonwealth Office (FCO) has changed its travel advice for parts of the Kenyan coast following a spate of attacks that have left at least 87 people dead.
A total of 22 people were killed in raids last Saturday in the village of Hindi in Lamu county, and Gamba in Tana River county, according to the Kenya Red Cross.
In June 65 people were killed when gunmen launched an attack in the coastal town of Mpeketoni.
The Somali militant Islamist group al-Shabab claimed responsibility for the attacks.
In the wake of the killings the FCO is advising against all but essential travel to Lamu county and the areas of Tana River county north of the Tana River itself.
Somali militants al Shabaab - the Islamist group behind the Westgate shopping mall in Nairobi - has claimed responsibility for Saturday night's raids on the Kenyan coast that have left at least 29 people dead.
The group said that it had broken into the police station at Gamba and freed suspects from the cells.
Their claim was supported by a Kenyan police source who said the group freed Muslim detainees, including some linked to the Mpeketoni two weeks ago that killed 65 people.
"There were two attacks in Lamu and Tana River last night. In Lamu we have nine people dead and in Tana River we have 20. The number could rise," ministry spokesman Mwenda Njoka said.
"They went around shooting at people and villages indiscriminately," Abdallah Shahasi, the area chief said.
The death toll in two separate attacks on the Kenyan coast overnight has risen to 29, according to the interior ministry.