Kenyan President Uhuru Kenyatta has said a siege by suspected militants in Nairobi is over and all the attackers have been "eliminated". Gunmen attacked the compound in the Westlands district of Kenya's capital on Tuesday, killing at least 14 people. Officials originally announced the end of the siege hours after it began, but gunfire and explosions were heard again early on Wednesday. The Somalia-based militant group al-Shabab said it was behind the attack. It is not clear how many attackers there were. The complex houses the DusitD2 hotel as well as offices. In a TV address to the nation, Mr Kenyatta said 14 people had been killed but 700 others were safely evacuated from the complex. However, the Kenyan Red Cross put the number of dead at 24. A US citizen is among the dead, the US state department said. He has been named as Jason Spindler. A British citizen with dual South African nationality was also killed and another Briton was wounded, the UK Foreign Office said. "I can now confirm that... the security operation at Dusit is over and all terrorists have been eliminated," the Kenyan president said. "We will seek out every person that was involved in the funding, planning and execution of this heinous act," he added, vowing to pursue them "relentlessly". "We are a country governed by laws, rules and regulations - a country that embraces peaceful coexistence... I must also state that we are also a nation that never forgets those who hurt our children." A stark reminder of al-ShababBy Andrew Harding, BBC News, Nairobi After 19 hours of terror, gunfire, bloodshed and inevitable confusion, the siege at an upmarket hotel and business complex in the hills west of Nairobi's central business district ended abruptly on Wednesday morning. Throughout the night, cowering groups of civilians - many had spent hours hiding in their offices or in bathrooms - were escorted to safety by security forces amid sporadic bursts of gunfire and the boom of explosions that continued well beyond dawn. On the crowded street outside the large, upmarket complex, friends and relatives embraced those who emerged and thanked Kenyan security forces. A fleet of ambulances stood ready to take the wounded to hospital. Kenya's vital but precarious tourism industry has been badly damaged by past terrorist attacks - not least Westgate and the 2015 attack on a university campus in Garissa - and by negative travel advice issued by foreign governments. Today President Kenyatta was quick to "assure every Kenyan and foreign visitor that you are safe". But this attack is a stark reminder that al-Shabab remains a powerful force, with the capacity to launch a sophisticated attack on a well-guarded target in a neighbouring country. How did the attack unfold?The attack began at about 15:00 local time (12:00 GMT) when four gunmen threw bombs at vehicles in the car park before entering the lobby, where one blew himself up, police say. A woman working in a neighbouring building told Reuters news agency: "I just started hearing gunshots, and then started seeing people running away raising their hands up and some were entering the bank to hide for their lives." Security camera footage showed at least four heavily armed men walking in and opening fire. There are reports they had been seen visiting the compound in recent days. AFP.