Colonel Daniel Naud from the Salvation Army was speaking after Belgian prosecutors said that several suspects linked with the terror attacks in Brussels are still at large.
So far, they have identified two bombers involved yesterday as brothers.
One left a note on a laptop found in a bin at the airport saying "I don't know what to do".
Colonel Daniel Naud, territorial commander of the Salvation Army's France and Belgium Territory, told Premier's News Hour how prayer can help in times of despair.
He said: "We need to think of all those who have lost their loved ones. We need to think of doctors and nurses who have dealt with people who were hurt.
"We need to plead in our hearts for the road to peace and hope.
"We know that we can find that in God's word."
On Tuesday, there were two explosions at Brussels Zaventem Airport at around 7am UK time, with another explosion on a Metro train at Maelbeek station, near the city's main EU buildings
34 people were killed and more than 200 were injured.
Islamic State (IS) claimed responsibility for the attack.
Belgium is in the midst of three days of mourning and government offices, schools and residents held a moment of silence on Wednesday morning to honour the dead.
Colonel Daniel Naud said he was in the city as the attacks were carried out: "We took the Metro up to the very heart of Brussels and we realised what happened because we saw, everywhere, police cars and ambulances. We heard alarms everywhere.
"We thought it was a sensation, war."
He went on to describe the atmosphere in Brussels: "I must confess that it was a really strange atmosphere as we were walking in the streets around 8/8:30, we could sense within the population there a very strange atmosphere."
Listen to Premier's Marcus Jones speak to Colonel Daniel Naud here:
