[Updated 2:20 p.m. ET] An explosion at a bus station in downtown Nairobi, Kenya, killed at least one person and injured eight Monday, according to the Kenyan police and Red Cross.
Charles Owino, a deputy police spokesman, confirmed the explosion and said he was awaiting more details.
Initial reports say the blast killed one person and injured eight, said Carol Nduta, a spokeswoman for the Kenyan Red Cross.
The blast follows a separate explosion that police said hurt 12 people earlier Monday at a nightclub in Nairobi.
"We have not yet linked attacks to anybody as we are still investigating," Owino said.
The explosions came a day after the U.S. Embassy in Kenya warned it had credible information of an imminent terror attack. The embassy did not offer details on who might carry out such an attack but said it had limited official U.S. government visits and urged citizens to consider deferring travel to Kenya.
The attack was likely to target places that foreigners congregate in Kenya, including malls and night clubs, the embassy said.
Kenya has been on edge since it sent troops across the border into Somalia to pursue militant with Al-Shabaab, an Islamist group that the United States and other countries view as a terrorist organization. Kenya sent in troops after the recent abductions of tourists and aid workers. It blames the abductions on Al-Shabaab, which has denied involvement.
Al-Shabaab has threatened to attack Kenya if it did not withdraw its forces from Somalia.
Owino, the police spokesman, said the nightclub attack "could be Al-Shabaab or an individual. We are still investigating."