keywords: colombia bogota colombian officerswere police
text: Ten Colombian Police Die in Marxist Rebel Ambush &lt;p&gt;&lt;/p&gt;&lt;p&gt; BOGOTA, Colombia (Reuters) - Ten Colombian police officerswere killed on Tuesday in an ambush by the National LiberationArmy, or ELN, in the worst attack by the Marxist group inyears, authorities told Reuters.&lt;/p&gt;