Scenes from the Brussels attacks

A series of deadly explosions rocked Belgium's capital Tuesday, targeting the main airport of Zaventem and the city's metro system.

Belgian Prime Minister Charles Michel told a news conference that terrorists had committed murder, labeling it a cowardly attack and said it was a black day for the country.

CNBC has put together a series of pictures, from within Brussels and around the world, depicting reactions to the horror.

—By CNBC's Matt Clinch

First published March 22, 2016.

Belgian Federal police spokesperson's office confirming that the three men in photo are considered the suspects in this morning's airport bombing in Brussels, Belgium.

An unidentified traveller lies on the ground in a smoke filled terminal at Brussels Airport, in Brussels, after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security.

In this photo provided by Evan Lamos passengers clamber from a metro carriage after explosions in Brussels Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security.

Emergency personnel at the scene of a blast outside a metro station in Brussels.

Two women wounded in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016.

Airport workers embrace as they leave Zaventem airport near Brussels, Belgium, following the explosions.

Broken windows seen at the scene of explosions at Zaventem airport near Brussels, Belgium.

People are evacuated from Brussels airport in Zaventem on March 22, 2016 following twin blasts.

A victim receives first aid by rescuers near Maelbeek metro station in Brussels.

Counter Terrorism Centre (TEK) personnel arrive with an APC vehicle at the parking facility of the Liszt Ferenc International Airport in Budapest, Hungary, Tuesday, March 22, 2016. Hungary raised its terrorism awareness level to grade 2 after a series of attacks in Brussels.

A security perimeter has been set up near Maelbeek metro station in Brussels after a blast at the station, which is near the European Union's main offices, caused deaths and injuries.

People wrapped in blankets leave the terminal buildings at Zaventem airport near Brussels.

A woman places flowers for the victims of the Brussels attacks, in front of the Belgian embassy in Moscow, Russia, March 22, 2016.

Belgium policemen stand guard at a security perimeter near Maelbeek metro station.

An armed policeman secures the access to the terminal area of the Frankfurt Airport. The increased security comes in the wake of the explosions in Brussels.

Activists of Pakistani civil society chant slogans during a rally to condemn the Brussels attack, in Multan, Pakistan, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lock down of the Belgian capital and heightened security across Europe. Placard at left reads, "we want peace in the world."

Security was also stepped up at Copenhagen Airport.

Belgian Federal police spokesperson's office confirming that the three men in photo are considered the suspects in this morning's airport bombing in Brussels, Belgium.