what its meaning?
"Two others, also from the CIA, compounded the crime by knocking down and killing a third Pakistani as they raced to Mr Davis’s aid."
how can I understand it? especially the " compounded the crime by knocking down "
another question "As it became obvious that the American was no ordinary diplomat—his car was jammed with extravagant bits of spy gear—anti-American street protests erupted."
what,s its meaning?
especially "anti-American street protests erupted."
thank you .everyboday....