A Twitter account affiliated with the Islamic State threatened that a bomb would be placed in one of three major international airports over the Fourth of July weekend. The account warned, "There will be a device placed in either Heathrow, LAX [Los Angeles] or JFK [New York] airports."
It also threated terrorist attacks against planes "flying from Heathrow to the US."
US officials said they knew of no "executable plan" to carry out a terrorist attack. However, British Transport Minister Lord Ahmad said that UK security services "will continue to take all steps necessary to keep the public safe."
Clarion Project's Ryan Mauro gave this interview in the waker of last week's Istanbul attack:
For more information about the Islamic State and its campaign to conquer the world please see Clarion Project's Special Report: The Islamic State (ISIS, ISIL)