"We were looking at having a real low year until June hit," said Sergeant David Walker from Tulsa Police Department.
There have been six homicides in June, all involving guns.
"There's a lot of people with guns and shooting, so we're missing a lot. When we see a high number misses, i'ts only inches before you hurt somebody and kill them," said Sgt. Walker.
He predicts that number could increase the next few months.
From 2014-2015, there were more murders in July and August compared to other months. There were nine murders July 2015 and nine in August 2014.
What could be the cause?
One of the factors that could contribute this high number of murders could be the hot weather.
"As it stands, the current literature does support that as temperatures rise, the tendency for humans to become more aggressive actually rises too," said Dr. Bryan Touchet, a psychiatrist at the University of Oklahoma.
He added that high temperatures could cause people to get irritated, might trigger stress and in some cases, might cause economic hardship, "which then might trigger more conflict between people."
How did other months of the year compare to July and August?
In May 2015, there were no homicides. The lowest number of murders in 2014 was two. They were committed in January, May and December.
How to prevent violent crime?
According to TPD, it comes down to aggressive policing on the streets.
"We're really putting it on our patrol officers and gang units to get out there and get these knuckleheads off the streets," said Sgt. Walker.