According to the UK's Daily Mail:
More than 100 professional clowns marched through the Salvadoran capital [on June 9, 2010] to protest against the killing of a bus passenger by two imposter clowns.
A man was shot five times in the face and stomach on Monday when he declined to give money to two assailants dressed as clowns who boarded a public bus in San Salvador. No-one has been arrested. Clowns make money by performing on public buses in the city.
Wearing oversized bow ties, tiny hats and big yellow trousers, the protesters...marched down San Salvador's main street in an effort to both entertain and educate passers-by. Several held signs insisting that real clowns are not criminals.
Ana Noelia Ramirez, a professional clown, said: 'We are protesting so that people know we are not killers.
'The people who did this are not clowns. They unfortunately used our costume and our make-up to commit a monstrous act.'
Clown union leader Carlos Vasquez said he plans to issue IDs to all real clowns and urged police to detain those who do not have them.
About a dozen people are killed daily in El Salvador, murders police attribute primarily to gang members, drug traffickers and other organized crime.
More than six million people live in the Central American country.
"Killer Clowns" by brownsk8ermm (deviant art).