A man breaks the lock of a cell in the infamous Saydnaya military prison, just north of Damascus, Syria. Crowds are gathering to enter the prison, known as the "human slaughterhouse," after thousands of inmates were released following the rebels' overthrow of Bashar al-Assad's regime on Sunday.

A rope lies on the floor in the infamous Saydnaya military prison, just north of Damascus, Syria.

Two insurgent fighters inspect the cells of the infamous Saydnaya military prison, just north of Damascus, Syria.

People walks into the basement of the infamous Saydnaya military prison, just north of Damascus.

Two men use their flashlights to inspect a corridor of the infamous Saydnaya military prison, just north of Damascus, Syria.

A prosthetic leg and a stretcher lie on the floor in the infamous Saydnaya military prison, just north of Damascus, Syria.

A woman examines the cells at the infamous Saydnaya military prison, just north of Damascus, Syria.

People inspect documents they found in the infamous Saydnaya military prison, just north of Damascus, Syria.

A man shows two ropes tied in the shape of nooses, found in the infamous Saydnaya military prison, just north of Damascus, Syria.

A man looks at a room of the infamous Saydnaya military prison, just north of Damascus, Syria.

People with relatives who were imprisoned wait outside the infamous Saydnaya military prison, just north of Damascus, Syria.

People stand outside the infamous Saydnaya military prison, just north of Damascus, Syria.

Two insurgent fighters examine documents scattered on the floor, searching for the names of government officers at the infamous Saydnaya military prison, located just north of Damascus, Syria.

A line of people heads toward the infamous Saydnaya military prison, just north of Damascus, Syria.

An arial view shows the infamous Saydnaya military prison, just north of Damascus, Syria.