It is low and leads to a pencil-narrow winding staircase so attackers could enter only one at a time.

One rule is to not allow attackers to enter from the Neutral Zone.

Michael was also the one patrolling the rear of the building, and that's where the attackers entered, without Michael so much as firing a shot.

The gate house with a draw bridge used to hinder attackers to enter the citadel.

The attackers entered the main building and rattled the locked metal grille of the safe haven.

Guards closed the doors of the Parliament building before the attackers could enter.

Only strike out if the attacker enters your personal safety zone.

But the attacker apparently then entered their system through another service provider.

Three employees were wounded on the dock before the attacker entered the lunch room and shot two more people.

The attackers finally breached the walls by sunset, and entered the city.