Hammer Fall all over again... Quoting: Aquarius58
Lucifer's Hammer is a post-apocalyptic science fiction novel by Larry Niven and Jerry Pournelle, first published in 1977.
Political lobbying by California Senator Arthur Jellison eventually gets a joint Apollo-Soyuz (docking with the second flight-worthy Skylab) mission into space to study the comet, dubbed "The Hammer" by popular media, which is expected to pass close to the Earth. Despite assurances by the scientific community that a collision with Earth is extremely unlikely, the public, fueled with religious fervor by the evangelist Henry Armitage, begins to hoard food and supplies in anticipation.
Eventually, to the shock of scientists at JPL in Pasadena, who could not track the trajectory accurately enough because of the comet's constant outgassing, the Hammer does fall, breaking up into several smaller comets that impact around the world with devastating results, striking parts of Europe, Africa, the Gulf of Mexico, and both the Pacific and Atlantic Oceans.
The strikes trigger several volcanoes and earthquakes around the world, including the San Andreas fault, heavily damaging the Southern California region and the rest of California, causing millions of casualties. Several of the fragments land in the ocean, causing further damage by the resulting tsunamis (which destroy several major coastal cities around the world, including Los Angeles, killing millions) and long-term climate problems due to the massive quantities of vaporized seawater.
[link to en.wikipedia.org
Remote controlled/satellite guided asteroids and now remote controlled/satellite guided comets?
Lasso My Comet: NASA Developing Comet Harpoon to Collect Data
[link to www.ibtimes.com