 Two women in a home in Chicago, a police officer serving a warrant in Cleveland, and an armed person making threats in Yellowstone National Park are among people who have been killed in shootings this year on the 4th of July. The holiday is historically one of the nation's deadliest days of the year. Violence in mass shootings often increase in the summer months, with more people gathering for social events, teens out of school, and hotter temperatures. Three boys ages 8, 7, and 5