The Latest: 5 suspected in Kenya attack appear in court The Latest: 5 accused of involvement in deadly Kenya attack appear in court

NAIROBI, Kenya -- The Latest on this week's Nairobi attack (all times local):

4:30 p.m.

Five people accused of involvement in this week's extremist attack on a Nairobi hotel complex have appeared in court, and prosecutors say there has been progress in the investigation.

Director of public prosecutions Noordin Haji says the investigations are complex and transnational and require sufficient time to uncover the entire "criminal syndicate."

Kenyan authorities say 21 people, including one police officer, were killed. All five attackers died.

———

11:45 a.m.

Kenyan investigators say one of the extremists who attacked a hotel and shopping complex in Nairobi this week was a son of a Kenyan military officer.

A senior police official says the military officer was summoned for questioning about when he last saw his son and any other details. The police official spoke Thursday on condition of anonymity because he is not authorized to speak to the media.

The Daily Nation, a Kenyan newspaper, on Friday identified the attacker as Ali Salim Gichunge and said his father is a sergeant with the Kenya Defence Forces. The newspaper says Gichunge's mother was arrested and taken to Nairobi for questioning.

Kenyan authorities say 20 civilians, one police officer and five attackers died in the assault Tuesday. The al-Shabab extremist group claimed responsibility.