The suspicious packages containing padded envelopes were found at an office block next to Heathrow Airport, the post room at Waterloo station and at offices near London City Airport in the east of the capital, according to Scotland Yard. “The packages — all A4-sized white postal bags containing yellow Jiffy bags — have been assessed by specialist officers to be small improvised explosive devices,” London’s Metropolitan Police said in a statement. Officers were called to Compass Centre at 9:55 local time (0955GMT), and two hours later the alarm was raised at Waterloo Station in central London. At 12.10, another suspicious package was reported at the offices of City Aviation House, at the Royal Docks in the east of the capital close to London City Airport. “The Met Police has issued advice to transport hubs across London to be vigilant for and report suspicious packages to police,” the force added.