BREAKING: At Least 28 Killed in Coordinated Brussels Terror Bombings

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Brussels Airport was hit by two blasts

UPDATE (8:05 CST): Fox News is reporting that a third unexploded suicide belt was just found at Brussels Airport, as well as a Kalashnikov rifle.

New photographs from The Daily Mail.

From Tribune News Services of the Chicago Tribune (6:35 CST):

Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 28 people were reported dead. 

A spokesman for the Brussels Metro said 15 people were killed and 55 injured in an explosion on a train, and Belgian media reported at least 13 dead in two explosions at the airport, with many others injured. 

Belgium raised its terror alert to the highest level, diverting planes and trains and ordering people to stay where they were. Airports across Europe immediately tightened security. 

"We are at war," French Prime Minister Manuel Valls said after a crisis meeting called by the French president. "We have been subjected for the last few months in Europe to acts of war." 

European security officials have been bracing for a major attack for weeks, and warned that the Islamic State group was actively preparing to strike. The arrest Friday of a key suspect in the November attacks in Paris heightened those fears, as investigators said many more people were involved than originally thought, and that some are still on the loose. 

A passenger hides under a checkout desk a few seconds after one of the blasts

There was no immediate claim of responsibility for Tuesday's attacks, and Belgian Prime Minister Charles Michel said there was no immediate evidence linking key Paris suspect Salah Abdeslam to them. After his arrest Friday, 

Abdeslam told authorities he had created a new network and was planning new attacks. 

Belgian media reported that 13 people were killed at the airport, where two explosions splattered blood across the departure lounge and collapsed the ceiling. The explosions hit during the busy morning rush. Smoke was seen billowing out of the terminal. 

Anthony Deloos, an airport worker for Swissport, which handles check-in and baggage services, said the first explosion took place near the Swissport counters where customers pay for overweight baggage. He and a colleague said the second blast hit near the Starbucks cafe. 

"We heard a big explosion. It's like when you're in a party and suddenly your hearing goes out, from like a big noise," Deloos said, adding that shredded paper floated through the air as a colleague told him to run. 

"I jumped into a luggage chute to be safe," he said. 

Tom De Doncker, 21, check-in agent intern, was near the site of the second explosion. 

"I saw a soldier pulling away a body," he said. "It felt like I was hit too" from the concussion of the blast. 

Zach Mouzoun, who arrived on a flight from Geneva about 10 minutes before the first blast, told BFM television that the second, louder explosion brought down ceilings and ruptured pipes, mixing water with victims' blood. 

"It was atrocious. The ceilings collapsed," he said. "There was blood everywhere, injured people, bags everywhere." 

"We were walking in the debris. It was a war scene," he said.  

At least 20 were killed in the subway car bombing

Near the entrance to Brussels' Maelbeek subway station, not far from the headquarters of the European Union, rescue workers set up a makeshift medical treatment center in a pub. Dazed and shocked morning commuters streamed from the metro entrances as police tried to set up a security cordon. 

"The Metro was leaving Maelbeek station for Schuman when there was a really loud explosion," said Alexandre Brans, 32, wiping blood from his face. "It was panic everywhere. There were a lot of people in the Metro." 

Francoise Ledune, a spokeswoman for the Brussels Metro, said on BFM television there appeared to have been just one explosion on the subway in a car that was stopped at Maelbeek. Spokesman Guy Sablon said 15 were killed and 55 injured in that attack. 

At the airport, passengers fled as quickly as they could. 

Amateur video shown on France's i-Tele television showed passengers including a child running with a backpack dashing out of the terminal in different directions as they tugged luggage. Another image showed a security officer patrolling inside a hall with blown-out paneling and what appeared to be ceiling insulation covering the floor. 

A police officer directs passengers out of the smoke-filled terminal

Marc Noel, 63, was about to board a Delta flight to Atlanta, to return to his home in Raleigh, North Carolina. A Belgian native, Noel says he was in an airport shop buying automobile magazines when the first explosion occurred 50 yards away. 

"People were crying, shouting, children. It was a horrible experience," he told AP. He said his decision to shop might have saved his life. "I would probably have been in that place when the bomb went off." 

With three runways in the shape of a "Z," the airport connects Europe's capital to 226 destinations around the world and handled nearly 23.5 million passengers in 2015. 

Passengers were led onto the tarmac and the crisis center urged people not to come to the airport. 

Authorities told people in Brussels to stay where they were, bringing the city to a standstill. Airport security was also tightened in Paris, London and other European cities. 

Survivors of the subway bombing embrace as a victim lies wounded 

In Paris, France's top security official said the country was immediately reinforcing security at airports, train stations and metros. 

The U.S. Embassy recommends American citizens in the Belgian capital shelter in place and avoid all public transportation. 

The Embassy said in a statement that citizens should "take the appropriate steps to bolster your personal security." 

"The U.S. Embassy reminds U.S. citizens that Belgium is at a threat rating of Level 4, or 'serious and imminent attack.' Such events can take place with little or no notice," it said. 

Associated Press, The Washington Post contributed.