(CNN) A Nairobi company has paid tribute to six employees who were killed during an attack in the city on Wednesday, when men armed with guns and explosives stormed a hotel and shopping complex.

Cellulant, an online payments company headquartered at the DusitD2 compound where the attacks took place, called the men "The Brave Six."

"They put their lives on the line in a true act of leadership, selflessness and bravery to save the lives of their fellow colleagues in the Riverside terrorist attack in Nairobi," the company wrote on its social media platforms.

A total of 21 people have been confirmed dead after the attack, which lasted for hours before ending on Wednesday morning.

Five suspects have been arrested, the Office of the Director of Public Prosecution confirmed on Friday.

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