MORNING HEADLINES: More info on MLK bomb, more county commissioners

Report sheds light on MLK bomb — The bomb consisted of a steel pipe welded to a steel plate and was stuffed with black powder. A rocket motor igniter may have been in use to ignite it. The bomb also contained lead fishing weights coated in a chemical found in rat poison. (SR)

Five county commissioners? — Activist Karen Kearney is spearheading a petition that would up the number of Spokane County Commissioners from three to five. (SR)

Is the Northwest next? — A seismologist in Oregon says the Northwest is due for a big quake. (KREM)

Guns on Idaho campuses — The state House passed legislation that would prohibit a ban on firearms on public university and college campuses. (KXLY)

Radiation plume could hit California tomorrow — A steadily dissipating cloud of radiation from the nuclear disaster in Japan hit the Aleutian Islands today and could reach California by tomorrow. (KHQ)