Most British pureblood wizards were still living in the previous century, and remained disdainfully ignorant of modern muggle technology. It was that ignorance which made it almost ridiculously easy for the American M-Team to surveil Riddle Manor. Despite their lopsided upper hand over the Death Eaters however, they could only observe and report unless an act of self-defense or prevention of harm to another was called for. When Peter Pettigrew revealed his secret to Riddle, and the two apparated away, Major Aquinas could guess where they were headed. After a quick call on his communicator, him and his team apparated to Godric's Hollow.
Captain Saxon and Sergeant Stalking Wolf, a USMC Scout/Sniper and apprentice Cherokee Shaman who recently transferred to MAGICOM, watched the Potter Cottage from approximately 75 meters away. Any potential hiding spot closer to the residence would have alerted the wards. Although the Fidelius Charm prevented them from actually "seeing" the place, the AN/PVS-666 MVG enabled them to the see the Charm's signature and they was more interested in the area around the house than the house itself. Saxon's earpiece buzzed and Stalking Wolf became more focused. Riddle and Pettigrew were on the way with the rest of the M-Team following them. While the ROE clearly prevented from from initiating an act of force, they could legally engage in self-defense or to prevent harm to an innocent bystander. Since it was obvious that Riddle was coming here with ill intent, the M-Team could act as soon as they confirmed Riddle's intentions.
Riddle and Pettigrew appeared just outside the wards, and Potter Cottage shimmered into view. With a single wave of his wand, the wards fell and Riddle strode to the door of the cottage, blasting it open, and walking inside. The M-Team apparates onto the property and starts running towards the cottage. A flash of green light appears from inside the cottage a mere second later. As Pettigrew raises his wand at the M-Team, Stalking Wolf sights the crosshairs of his M40's scope on the center of Pettigrew's head, and soon the rat is exterminated. Aquinas reached the door of the cottage and was moving towards the stairs, CAR-15 at the ready. As he ascends the stairs, another green flash.
As Riddle steps past Lily's body, he is aware of multiple presences inside the cottage. He's not concerned. As soon as he deals with the Potter child and the prophecy, he'll take care of the interlopers who dare bother him at such a crucial time. He raises his wand and utters the Killing Curse just as three magically-enhanced 5.56mm NATO rounds enter his chest cavity and tear his heart to shreds.