August 21, 2004 (Saturday)
- The West Nile virus is now responsible for six deaths in California, with the number of people infected with the virus at 249. (HealthTalk.ca)
- Mexico, Honduras and Panama, among many other countries, are put on high alert about a possible Al-Qaida attack in Latin America. (Columbia Daily Tribune) (Tucson Citizen)
- 2004 Dhaka grenade attack: Grenade attack on Bangladesh Awami League, the biggest political party in this country. Party president Sheikh Hasina was injured; 23 others were killed.