Somalia-based terrorist group, al-Shabab has claimed responsibility for a huge attack on a commercial building complex in Kenya’s capital, Nairobi this Tuesday.

The facilities attacked at the complex located in Nairobi’s Westlands neighborhood  include a large hotel known as DusitD2, banks and business offices. The attack started around 3 p.m. with an explosion targeting three vehicles outside a bank.

A suicide bomber, according to a statement by the Kenyan National Police, then blew himself up in the hotel lobby as people rushed to safety or took shelter inside the buildings.

The number of casualties from this terrorist attack remains unclear although some eye witnesses put the possible figure as between 10 and 20. The Police have said they were at the scene to “engage the attackers.” According to them:

“We are aware that armed criminals are holding up in the hotel and specialist forces are now currently flushing them out. However, we regret to inform that there have been injuries in the attack and we are in the process of confirming the numbers and types of injuries incurred.

“We have been vigilant throughout the holiday season and therefore all public and other hotel premises remain under close watch. Reports from throughout the country indicate that everything remains calm and normal.”