The theft of the encrypted computer follows another data breach by MI6.
MI5 has followed the lead of its fellow intelligence service and had its very own potential data breach.
Apparently, a thief took advantage of an open window to steal the “handheld computer” from a house in Manchester which is rented by MI5.
A police spokesman told the Telegraph newspaper: "An encrypted hand-held computer was stolen. It is believed the offender entered through an open window."
This incident comes just days after an MI6 camera containing photos and other data on suspected terrorists was sold on eBay.