Bloomberg is leading the call for stricter gun laws after the shooting at Sandy Hook Elementary School.
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He came along with a shotgun on his shoulder while a group of children were playing in front of the school. Without warning or provocation, he raised the gun to his shoulder, took deliberate aim, and fired into the crowd of boys.
Although it sounds sadly modern, the account was published in the New York Times more than a century ago.
Dated April 10, 1891, the article described an elderly man firing a shotgun at children playing in front of St. Mary's Parochial School in Newburgh, NY.
"None of the children were killed, but several were well filled with lead," the report said.
More than a century earlier, on July 26, 1764, a teacher and 10 students were shot dead by four Lenape American Indians in Greencastle, Pennsylvania, in what is considered the earliest known U.S. mass school shooting.
Indeed, killing or trying to kill a mass of people is not a modern phenomenon. For as long as there has been history, there have been gruesome mass murders.
"The terms amok, a Malayan word, and berserk, a Norse word, have been used to describe individuals going on killing sprees. Both terms have been around for centuries, which reflects the fact that mass murder is neither a modern nor a uniquely American phenomenon," Grant Duwe, director of research at the Minnesota Department of Corrections, told Discovery News.
Defined as bloody events that occur within a 24-hour period and that involve a minimum of four victims, mass murders have occurred all over the world, in different times, societies and cultures.
Some of the earliest recorded cases include the 1893 killing with guns and swords of 11 people (including an infant) in Osaka, Japan, the 1914 shooting of 7 people in the Italian village of Camerata Cornello, not to mention the case of German spree killer Ernst August Wagner.
In 1913, he stabbed to death his wife and four children in Degerloch, near Stuttgart, then drove to Mühlhausen an der Enz where he opened fire on 20 people, killing at least nine, leaving two animals dead and several buildings burned to the ground.
In 1927, South African farmer Stephanus Swart shot dead at least 8 people and injured 3 others in Charlestown, South Africa, before committing suicide.
In 1938 almost half of the population of the rural village of Kaio, near Tsuyama city in Japan, was murdered as 21-year-old Mutsuo Toi killed 30 people with a shotgun, sword and axe, injured three others and then shot himself to death.
Between 1954 and 1957, William Unek murdered a total of 57 people in two separate spree killings in the Belgian Congo.
He first killed 21 people with an axe, then shot dead ten men, eight women and eight children, slaughtered six more men with the axe, burned two women and a child, and strangled a 15-year-old girl.
More recently in the bloody timeline of shooting sprees, some of the most dramatic incidents include the 1987 Hungerford massacre in England, where gun enthusiast Michael Ryan shot 16 people dead and wounded another 15 before committing suicide, the 1996 Port Arthur massacre in Australia, where 28 year old Martin Bryant killed 35 people and wounded 21 before being caught by police, and the 1996 school shooting in the Scottish town of Dunblane.
There, failed shopkeeper Thomas Hamilton opened fire at a primary school, killing 16 children and a teacher before turning his gun on his mouth.
"I could have been one of those children," tennis player Andy Murray wrote in his autobiography, "Hitting Back."
Britain's highest ranked player, Murray was eight when Hamilton burst into the school and began shooting. He and his 10-year-old brother Jamie escaped the fire by hiding under a desk.
In the United States, two mass murder waves characterized the 20th century. One appeared in the 1920s and 30s and another in the mid-1960s, following a tranquil period in the 1940s and 50s.
The two waves, however, were qualitatively different, according to Duwe.
The author of "Mass Murder in the United States: A History," Duwe researched 909 cases of mass killing that occurred in the United States between 1900 and 1999.
"The first mass murder wave in the 1920s and 30s was comprised mainly of familicides and felony-related massacres, which, then as now, are less likely to garner extensive media coverage," Duwe said.
On the contrary, the second mass murder wave from the mid-1960s through the mid-1990s consisted of a greater number of mass public shootings, similar to the recent Aurora movie theater shooting and Newtown school shooting.
These incidents "have always captured a great deal of interest and concern," Duwe said.
Marked by the 1966 Texas Tower shootings where student Charles Whitman climbed a 27-story tower on the University of Texas campus shooting dead 14 people and wounding 31 others, the mid-1960s do not actually represent the beginning of an unprecedented mass murder wave in the United States.
"Since 1900, the highest mass murder rate was in 1929. Mass public shootings are one of several types of mass murder and generally account for roughly 10-15 percent of all mass killings in the U.S.," Duwe said.
According to the criminologists, the 1990s had the highest number of mass public shootings with a little more than 40 -- an average of a little more than 4 each year.
The number of mass public shootings dropped below 30 in the years between 2000 and 2009.
"This year, however, the U.S. has had at least seven mass public shootings, which is the highest number since 1999," Duwe said.
This story was provided by Discovery News.