The parents of a British man who died in police custody in Kenya say they are still seeking justice, 18 months after their son's death.
An Al-Shabaab recruitment video makes reference to 10 British militants, raising the possibility of links to the attack on a mall in Kenya.
British investigators are struggling to pierce the secrecy surrounding Kenya's Westgate mall attack.
Three people have reportedly been killed after two gunmen attacked a church near the Kenyan city of Mombasa.
"Two people wearing masks entered the church and then started spraying bullets at us," worshipper Margaret Mwangi told Reuters.
Muslim youths fought street battles today with Kenyan police outside a mosque where radical clerics regularly preach in the port city of Mombasa, a witness told Reuters.
The police fired tear gas and live rounds over the heads of crowds who hurled stones back. It was not immediately clear why the clashes had broken out.
The FBI believe the four gunmen who stormed a shopping centre in the Kenyan capital Nairobi last year, killing at least 67 people, died in the attack.
The Islamist group Al-Shabaab claimed responsibility for the September 21 attack on the Westgate Mall, which led to a three-day siege, though the fate of the gunmen has never been confirmed.
Dennis Brady, the FBI legal attache in Nairobi, said in an interview on the bureau's website: "We believe, as do the Kenyan authorities, that the four gunmen inside the mall were killed."
He added: "Our ERT (Evidence Response Team) made significant finds, and there is no evidence that any of the attackers escaped from the area where they made their last stand."
At least 10 people have been injured in a grenade attack at a Kenyan tourist resort south of the city of Mombasa, according to police.
Attackers reportedly threw the grenade into a bar in the Diani area.
"We had an explosion at the bar and about 10 people were injured," local police chief Jack Ekakuro, told local media.
The injured people are believed to be in a stable condition in hospital.
Five people are believed to have been injured after a freight train derailed while passing through a Kenyan slum.
The Kenya Red Cross has tweeted several pictures of the train lying on its side.
A suspected grenade attack on a minibus on the Kenyan capital Nairobi has killed at least four people near a Somali-dominated area of the city, police said.
"So far I can confirm that four people have died in the explosion," Benson Kibui, Nairobi county police commander, according to Reuters, without giving details. Another police officer described it as a grenade attack.
The British tourists who reportedly has a grenade thrown at them in Kenya were travelling in a van from Diani in Kwale to Mombasa when it was targeted as it slowed down, police told the Kenya-based Standard Digital.
"He vanished soon after he hurled the explosive," police chief Robert Kitur told the paper.
The grenade failed to explode and is being examined by police.
The attack comes on the same day Kenya celebrates 50 years of independence from British colonialist rule.
The Foreign Office said it is "urgently" looking into reports that a grenade has been thrown at a group of British tourists in Mombasa, Kenya.
"The grenade was detonated safely by experts," Mombasa police chief Robert Kitur said, according to Sky News. "We are investigating the incident and looking for the man who threw the grenade at the tourists and fled."
The Kenyan president Uhuru Kenyatta has tweeted his condolences to Nelson Mandela's family and friends:
It is with profound sorrow that I have learnt of the passing away of ‘Shujaa’ Nelson Mandela, an outstanding African statesman and icon
On behalf of the Gov't and the people of Kenya and on my own behalf, I wish to express our deepest condolences to his family and friends
He believed in the noble principles of equity, justice, cohesiveness and inclusiveness in governance #RIPNelsonMandela
Two Britons have reportedly been arrested by police in Kenya, with the Foreign Office looking into the incident.
– Foreign Office spokesman
We are looking into reports of two British nationals detained in Kenya. We stand ready to offer consular assistance.