Brussels, Belgium (BBN)-Two explosions have hit Brussels' Zaventem airport, killing up to 13 people and injuring dozens, hospital sources told local media.
Shortly after the airport blasts on Tuesday morning, an explosion also struck the Maelbeek metro station in the centre of the Belgian capital, killing 15 people, Belgian media reported.
The station is close to European Union institutions, reports the Aljazeera.
The Belgian federal prosecutor told state media the explosion at the airport was a suicide attack.
Footage from the airport - the country's largest - showed people running from the terminal building as plumes of smoke rose to the sky.
The powerful blasts caused parts of the ceiling to fall down and windows were shattered.
All metro lines were shut down after the attacks.
Witnesses at the Maelbeek station said people with blood on their faces were seen at the scene.
Ian McCafferty, a witness at the station, said the blast happened during busy rush hour traffic.
"People started running when they saw smoke coming," he said. "The point of these attacks is to make you live in fear, but I refuse to."
The interior ministry raised the country's terror alert to the highest level after the blasts and Brussels' crisis centre told people: "Stay where you are".
The interior minister said 600 additional police had been deployed.
Reuters news agency said shots were fired before the explosions at the airport.
Local media reported the blasts happened near the American Airlines counter as hundreds of people were checking in.
"When I heard the first explosion, lots of people started screaming and running," Tom, an intern working at the airport, told Al Jazeera.
"When I heard the second explosion, which was about 30 seconds after the first one, everything got chaotic. I could see panic on everyone’s face, blood on their bodies."
Police were clearing the area of stranded passengers, some in shock.
Belgian Prime Minister Charles Michel called for unity in a news conference.
"We are facing a difficult, challenging time and we should face up to this challenge by being united," he said.
“What we feared has happened, we were hit by blind attacks."
ABDESLAM ARREST
The country had been on high alert since the arrest in Brussels last week of Salah Abdeslam, a key suspect in last November's Paris attacks that left 130 people dead.
Belgium's Interior Minister Jan Jambon said on Monday the country was aware of the risk of a possible revenge attack following the capture of the 26-year-old.
"We know that stopping one cell can ... push others into action. We are aware of it in this case," he told public radio.
BBN/SK/AD