The United States has warned its citizens in Kenya ahead of visit by President Barack Obama of the risk of terrorist attacks, singling out a conference that Obama is due to address.

The U.S. president is scheduled to give a speech to the Global Entrepreneurship Summit (GES) in Nairobi, which opens on July 24.

Suspected militants from the Somali-led Shebab Islamist group killed at least five people in a roadside bomb attack, police said Tuesday.

The attack on a police truck took place on Monday in the eastern coastal county of Lamu, which borders Somalia and has been hit by a wave of attacks by the al-Qaida linked group.

Suspected militants from the Somali-led Shebab Islamist group carried out a bomb attack against Kenyan police on Monday, but the officers escaped unharmed, a Kenyan official said.

The attack took place in the coastal county of Lamu, which borders Somalia and has been hit by a wave of attacks by the Al-Qaida linked group.

Two Kenyan policemen have been freed after over two years being held hostage in Somalia by Shebab militants, Kenya's police chief said.

The police constables, Joseph Wambugu and Fredrick Chirchir, were kidnapped in an attack in May 2013 in Kenya's northeastern Garissa district, when four other officers were killed.

Dozens of Kenyans demonstrated in the capital on Wednesday to demand direct U.S. compensation for victims of the 1998 embassy bombing in Nairobi.

The protest was held just over two weeks before U.S. President Barack Obama is due in Kenya, his father's birthplace.

Shebab militants killed at least 14 workers in northern Kenya on Tuesday, officials said, the latest in a wave of attacks in the east African nation by the Somali-led Islamists.

The attack occurred just outside the town of Mandera in Kenya's far northeastern region, which borders Ethiopia and war-torn Somalia, and comes a little more than two weeks before U.S. President Barack Obama is due to make his first presidential visit to Kenya, where his father was born.

Eight people have died and scores more have been wounded in a crackdown in Kenya on illegally brewed alcohol, reports and officials said Saturday.

Hundreds of people have also been arrested, business premises destroyed and thousands of liters destroyed in the operation, sparked by government concern over rising alcoholism and a recent spate of deaths linked to illicit drinks.

Foreign fighters with Somalia's Shebab insurgents pose a risk to Europe if troops fail to stop them, Kenya's deputy president warned Thursday, days after the first British jihadi was killed in Kenya.

"Foreign fighters from far afield, some from Europe, are in the field here in the Horn of Africa," Kenyan Deputy President William Ruto said, speaking at conference in Nairobi on countering violent extremism.

Kenya has lifted anti-terrorism restrictions on the biggest money transfer company working in Somalia put in place after April's Garissa university massacre, the company said Monday.

"We are delighted to resume our services in Kenya," said Abdirashid Duale, chief executive of Dahabshiil, the biggest of 13 companies banned more than two months ago.

Britain has relaxed travel warnings for Kenya's Indian Ocean coastal regions, a key tourist region critical to the country's economy.

Restrictions put in place in March due to fears of attacks by the Somali-led Shebab insurgents along most of the coast were lifted late Thursday by London's Foreign Office.