Letter bomb explodes, catches fire in Amsterdam office, fourth for Netherlands in two days

A fourth letter bomb found within a two-day period in separate locations across the Netherlands exploded Thursday in Amsterdam in the latest wave of threats made from extortionists demanding payment made in the form of Bitcoin dating back to last month. Three explosives – two found in businesses in Amsterdam and another in a Dutch town bordering Germany -- were the first to detonate – but the explosions did not cause any serious injuries.