MEXICO CITY, Aug 4 (Reuters) - Powerful drug cartels are increasingly using gruesome videos of executions and interrogations to intimidate their rivals, police and an already terrified public in Mexico's escalating drug war.
Below are some of the worst attacks since President Felipe Calderon took office in December 2006 and declared war on cartels. Some 28,000 people have been killed in drug-related violence since then.
* July 18, 2010 - Gunmen burst into a birthday party in the northern city of Torreon, using automatic weapons to kill 17 revelers and wound 18 others. Mexican authorities later said those responsible were incarcerated cartel hitmen who were let out of jail by corrupt officials in order to commit murders with weapons and vehicles borrowed from the prison guards. The killers then returned to their cells.
* July 15, 2010 - A car bomb with 22 pounds (10 kilos) of explosive killed four people in Ciudad Juarez, in a blast that was detonated by cell phone. It is the first such attack since Calderon took office.
* June 28, 2010 - Suspected cartel hitmen shot dead a popular gubernatorial candidate in the northern Mexican state of Tamaulipas in the worst cartel attack on a politician to date. Rodolfo Torre, 46, and four aides from the opposition Institutional Revolutionary Party, or PRI, were ambushed on their way to a campaign event for the July 4 state election.
* June 11, 2010 - Two-dozen gunmen toting automatic weapons burst into a drug rehabilitation clinic in the northern city of Chihuahua and killed 19 addicts ranging in age from 18 and 25.
* March 28, 2010 - Gunmen in northwestern Durango state killed 10 people aged eight to 21 after the pick-up truck they were traveling in sped through a roadblock on an isolated highway in the drug-producing "Golden Triangle" region.
* March 13, 2010 - Hitmen killed 3 people linked to the U.S. consulate in Ciudad Juarez in March, provoking "outrage" from U.S. President Barack Obama.
* Jan. 31, 2010 - Suspected cartel hitmen burst into a party and killed 13 high school students and two adults in Ciudad Juarez.
* Sept. 15, 2008 - Suspected members of the Zetas drug gang tossed grenades into a crowd celebrating Mexico's independence day in the western city of Morelia, killing eight people and wounding more than 100. It was the first, and so far only, attack by drug gangs on a mass gathering of civilians.
04 Aug 2010