@ John Chance
Taking a closer look at the spots where the four men died, there is no evidence that they even had a chance to fight back. Your chaperon indicates he was the man who was shot died near the front gate. Chance can see that it was at close range with a tight grouping of four shots to the chest that suggest a semi-automatic weapon. The wounds, in his experience, indicate a light pistol using armor piercing rounds. This is based off of the size of the entry and exit wounds.
The man with seemingly no injuries was in the center of the courtyard and would have had a line of sight to the gate. Actual inspection of the man shows that his neck was snapped. Lack of bruising at the neck indicates an extremely quick and brutal kill.
The garroted man and the stabbed man were found on paths from which assailants could have hid in bushes and jumped out at the appropriate moments. The stabbed man's wounds are from a large, broad bladed knife, a combat blade of some sort. The strike was precise, entering between ribs, through a lung and probably piercing the heart.
@ Tanya
The lock, as mentioned before, was physically torn apart. It doesn't look pries, as if with a crowbar. It's a standard maglock on a door that enteres into a viewing room which is open during the day. There are other items within the room that were left behind. The chaperon informs you, when you ask, that these items are of little value besides the spiritual one they hold for visitors to the temple.
The lock looks like somebody just clawed fingers into it and ripped it most out, leaving it hanging. The door is strong wood, so it's not an impossible feat, but a damn impressive one. An augmented troll, perhaps... or a spirit.
Despite looking, there are no signs of any calling cards and the site seems clean.
@ Calico
Calico can see traces of magic throughout the courtyard. With no real skill to assense, she can't read any of it, no way to tell if it's ambient to the temple or had anything to do with the attacks.
@ Kumiho
Given a mark on the host you are able to access the camera feeds. Unfortunately, at about 1am, the cameras go dark, probably hit by a decker for the assault. Working around the time in question, you can see the men on guard. One stays at the front gate, one hangs in the open courtyard, and two men on patrol. They come on at 8 and are replaced at 4. The replacements are dead when the cameras resume recording at 2 and discovered by the shift change at 4 in the morning.
Working around the times involved you continue looking for something, anything that might help when you see a dark Ford Americar parked in the distance with a line of sight to the front gate. It's there from sundown until the cameras go dark. When he cameras come back up... it's gone.