[beilabs]

Starship Troopers covered it pretty well

"Thirty years before the First Interstellar War, a meteorite from Klendathu System was deviated from its star during the Operation Fedmil, the first contact in Klendathu. Thirty years later, the meteorite reached and hit Earth, destroying Buenos Aires, capital of Argentina, killing over 8.7 Million, and wounding a further 12.5 million."

"However, the United Citizen Federation claimed that the Arachnid launching a "Bug Meteor" by Bug Plasma from the Klendathu system towards Earth and destroyed the city of Buenos Aires."