The two suicide bombers, thought to be members of the armed opposition to President Bashar al-Assad, detonated their devices near the Air Force Intelligence headquarters and the Military Intelligence building, wounding over 100 others.
According to state television, the bombings had killed at least eight people.
More than 20 people killed in the massive explosions that have shaken the city of Idlib, the Syrian Observatory for Human Rights said in a statement on its Facebook page.
The explosions targeted security centers hence the majority of the [dead] people are members of the security forces.
It was reported that members of the United Nation's tiny observer force, in the country to oversee Syria's 18-day-old ceasefire, were on their way to visit the scene.
My wife and I were asleep in bed and then there was a loud explosion. It rocked the whole house and woke us all up. My wife and I and our children all ran outside, said a man interviewed on state TV, according to Reuters.
Is this the freedom they want? How can it be the fault of children? How can the innocents be to blame?
The latest in a string of explosions across the country symbolizes the rebels shifting tactics, away from small-scale ambushes to attacks on the regime's infrastructure and buildings.
We are starting to get smarter about tactics and use bombs because people are too poor and we don't have enough rifles. It is just no match for the army. So we are trying to focus on the ways we can fight, said one anti-Assad fighter who claimed to be in command of a militia unit.
The rebels are getting better at bomb-making -- as you know, desperation is the mother of invention, he told Reuters in neighboring Lebanon.
Last week, a massive explosion in the Syrian city of Hama has killed 70 people, according to opposition forces.