The final launch in the Pioneer lunar probe program with Atlas Able booster rocket carrying Pioneer P-31. Launch vehicle went out of control and exploded at an altitude of 12,200 m off Cape Canaveral.
NASA
1960-12-15
Source: <a rel="nofollow" class="external text" href="http://www.planet4589.org/space/">NASA/USAF via Jonathan's Space Home Page</a>