Firefighters and police officers are looking for the victims in the apparent terrorist attack at a shopping complex in center Nairobi. A blast struck the shopping complex in Nairobi's business district during Monday's lunch hour, wounding more than two dozen people. The blast was initially said to be caused by an electrical fault, but rumors also talked about a bomb attack.

Police Commissioner Mathew Iteere told reporters it was too early to determine the cause of the blast. He said blackened wires inside the trading center indicated a possible electrical fault and ruled out a grenade attack.

Two shopkeepers, however, told Reuters independently that they saw a man drop a bag inside the trading center moments before the blast. "He came into the shop twice, looking at T-shirts. He said he didn't have money so he left. Then he came back," said Irene Wachira. "(He was) three shops away from where I was. He left a bag and a few moments later we had an explosion. The roof caved in and debris started falling on us," Wachira said.

"This is terrorism... this is a heinous act, we are under threat but we will not be cowed," Kenya prime minister Raila Odinga said. "The lives and property of Kenyans are precious and must be protected, we condemn the terrorists and tell them that their days are numbered."

At least 28 people were wounded, four of them in a critical condition, the Kenya Red Cross said.