entire European region on alert. What we know so far: three explosions ripped through a

Brussels airport and a metro station in the Belgian capital... killing more than 20 people

and injuring over one-hundred. The suspected terrorist attacks come just

days after Belgian police arrested one of the men suspected in the fatal Paris terror

attacks last November. Bruce Harrison has the latest.

Belgian media have described the explosions at the busy Brussels airport as a suicide

attack. A witness said he heard shouts in Arabic before

two blasts struck the airport's crowded departure lounge... killing at least 11 people.

Another witness escaped the chaos in a bathroom.

"I just went to the toilet, and then after five minutes I heard an explosion and all

the ceilings is going down. And then I just go under the sink and then the second explosion

went and everything is black."

She said she emerged to see people covered in blood.

Shortly after,... another blast tore through a rush-hour metro train in Brussels... killing

at least 15. All public transport in the capital has been

shut down. Terrorism analysts say attackers could have

been planning the bombings for some time... and may have pushed up the date after the

capture of Salah Abdeslam... the man Belgian police arrested several days ago in connection

to last year's terror attacks in Paris.

"The reconnaissance, the coordination, the preparation for these kind of attacks generally

takes weeks rather than days. But it may have been that there was an existing plot that

the attackers were moving towards that has been accelerated in the aftermath of Abdeslam's

arrest."

The disruption of economic and infrastructure in Belgium, and other Western and European

countries are also expected to be significant in the coming days and weeks.

"Well there's clearly in the next day or two going to be severe travel delays and disruptions

across Europe. The militants have shown a knowledge of the key targets to hit to cause

maximum disruption in a country, whether that's to travel, to economies etc."

European leaders have condemened the attacks... as did leaders around the world, including

officials in South Korea.

"South Korean government maintains its position that it cannot accept terror in any reasons,

strongly condemn today's terror, and express condolences for the victims, their families,

and the Belgium government."

Officials said they're working to determine if any Koreans were injured in the attacks...

and encouraged all those abroad to be careful in that region.

ANCHOR TAG Of course this story developing as we speak...

and Arirang News will keep you updated throughout the night.