NAIROBI, Kenya - A massive fire engulfed the arrivals hall at Kenya's main international airport early Wednesday, forcing East Africa's largest airport to close and the rerouting of all inbound flights.

Dark black smoke that shot skyward was visible across much of Nairobi as emergency teams battled the blaze. Stranded passengers stood on sidewalks outside the airport with their luggage in hand.

"It was huge, the smoke billowing, and it didn't seem to be stopping," said Barry Fisher, who had hoped to fly to Ethiopia on Wednesday morning.

Associated Press reporters at the scene said the fire had gutted the international arrivals hall, where passengers pass through immigration and retrieve their luggage. The Kenya Airports Authority said the Jomo Kenyatta International Airport has been closed until further notice so that emergency teams could battle the fire.

While there were no immediate signs that terrorism played any role in the fire, Kenya's anti-terror police boss, Boniface Mwaniki, told The Associated Press that he wanted to wait for the fire to be put out so that he could inspect the scene before making any judgment.

Michael Kamau, the cabinet secretary for transport and infrastructure, said the fire began at 5 a.m. in the immigration section of the arrivals hall. He said no injuries had been reported. Inbound flights were diverted to the coastal city of Mombasa, he said.

As in many countries in East Africa, public sector services like police and fire units are hobbled by small budgets and outdated or no equipment. A British passenger, Martyn Collbeck, said he was surprised that the airport wasn't shut down sooner so that emergency vehicles could respond.

"When I arrived there were one or two fire engines parked outside the international arrivals. It spread very fast," said Collbeck, who had been scheduled to fly back to London on an early morning KLM flight. "There were a couple of explosions which I think were a couple of gas canisters."

But, he added: "I would have expected more fire engines to respond faster."

The Nairobi airport is the busiest airport in East Africa, and its closure is likely to affect flights throughout the region.

Fisher, a trade specialist who lives in Nairobi, described the scene as chaos.

"There was no one stopping any traffic going to the road to the airport," he said. "A number of fire trucks and ambulances were trying to negotiate their way through the lane. ... They were trying to weave their way through a solid two lanes of cars."

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  • KENYA-AIRPORT-FIRE

    General Service (GSU) officers stand outside the burning Jomo Kenyatta international airport on August 7, 2013. A massive fire shut down Nairobi's international airport today with flights diverted to regional cities as firefighters battled to put out the blaze in east Africa's biggest transport hub. AFP PHOTO/Stringer (Photo credit should read STRINGER/AFP/Getty Images)

  • Black smoke billows from the Jomo Kenyatta International Airport in Nairobi, Kenya Wednesday, Aug. 7, 2013. The Kenya Airports Authority said the Kenya's main international airport has been closed until further notice so that emergency teams can battle the fire. (AP Photo/Sayyid Azim)

  • People watch a large blaze raging at the Jomo Kenyatta International Airport in Nairobi, Kenya, early Tuesday, Aug. 7, 2013. The Kenya Airports Authority said Wednesday that Kenya's main international airport has been closed until further notice so that emergency teams can battle the fire. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT

  • KENYA-AIRPORT-FIRE

    General Service (GSU) officer stand outside the burning Jomo Kenyatta international airport on August 7, 2013. A massive fire shut down Nairobi's international airport today with flights diverted to regional cities as firefighters battled to put out the blaze in east Africa's biggest transport hub. AFP PHOTO/Stringer (Photo credit should read STRINGER/AFP/Getty Images)

  • People watch dense black smoke billowing from the Jomo Kenyatta International Airport in Nairobi, Kenya, early Wednesday, Aug. 7, 2013. Firefighters are battling a large blaze raging at Kenya's main international airport. The Kenya Airports Authority said Wednesday that the airport has been closed until further notice so that emergency teams can battle the fire. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT

  • A blaze rages the arrivals hall at the Jomo Kenyatta International Airport in Nairobi, Kenya Wednesday, Aug. 7, 2013. The Kenya Airports Authority said the Kenya's main international airport has been closed until further notice so that emergency teams can battle the fire.(AP Photo/Sayyid Azim)

  • Policemen look at the fire near the international arrivals unit of Jomo Kenyatta International Airport, Nairobi, Kenya, Wednesday, Aug. 7, 2013. A massive fire engulfed the arrivals hall at Kenya's main international airport early Wednesday, forcing East Africa's largest airport to close and the rerouting of all inbound flights. Dark black smoke that billowed skyward was visible across much of Nairobi as emergency teams battled the blaze. (AP Photo/Sayyid Azim)

  • Policemen stand guard as fire rages at the International arrivals unit of Jomo Kenyatta International Airport, Nairobi, Kenya, Wednesday, Aug. 7, 2013. A massive fire engulfed the arrivals hall at Kenya's main international airport early Wednesday, forcing East Africa's largest airport to close and the rerouting of all inbound flights. Dark black smoke that billowed skyward was visible across much of Nairobi as emergency teams battled the blaze. (AP Photo/Sayyid Azim)

  • Firefighters try to extinguish fire at the international arrivals unit of Jomo Kenyatta International Airport, Nairobi, Kenya, Wednesday, Aug. 7, 2013. A massive fire engulfed the arrivals hall at Kenya's main international airport early Wednesday, forcing East Africa's largest airport to close and the rerouting of all inbound flights. Dark black smoke that billowed skyward was visible across much of Nairobi as emergency teams battled the blaze. (AP Photo/Sayyid Azim)

  • Kenya Airforce personnel view the damage after fire engulf the international arrivals area of Jomo Kenyatta International Airport, Nairobi, Kenya, Wednesday, Aug. 7, 2013. A massive fire engulfed the arrivals hall at Kenya's main international airport early Wednesday, forcing East Africa's largest airport to close and the rerouting of all inbound flights. (AP Photo/Sayyid Azim)

  • Armed policemen cordon off the area as fire rages at the international arrivals unit of Jomo Kenyatta International Airport, Nairobi, Kenya, Wednesday, Aug. 7, 2013. A massive fire engulfed the arrivals hall at Kenya's main international airport early Wednesday, forcing East Africa's largest airport to close and the rerouting of all inbound flights. Dark black smoke that billowed skyward was visible across much of Nairobi as emergency teams battled the blaze. (AP Photo/Sayyid Azim)