Mass murder (in military contexts, sometimes interchangeable with "mass destruction" or "genocide") is the act of murdering a large number of people (four or more), typically at the same time or over a relatively short period of time.[1] According to the FBI, mass murder is defined as four or more murders occurring during a particular event with no cooling-off period between the murders. A mass murder typically occurs in a single location in which a number of victims are killed by an individual or more.
http://en.wikipedia.org/wiki/Mass_murder
Genocide is "the deliberate and systematic destruction, in whole or in part, of an ethnic, racial, religious, or national group",[1] though what constitutes enough of a "part" to qualify as genocide has been subject to much debate by legal scholars.[2] While a precise definition varies among genocide scholars, a legal definition is found in the 1948 United Nations Convention on the Prevention and Punishment of the Crime of Genocide (CPPCG). Article 2 of this convention defines genocide as "any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such: killing members of the group; causing serious bodily or mental harm to members of the group; deliberately inflicting on the group conditions of life, calculated to bring about its physical destruction in whole or in part; imposing measures intended to prevent births within the group; [and] forcibly transferring children of the group to another group."[3]
http://en.wikipedia.org/wiki/Genocide
