The city of St. Louis has, , the highest murder rate, per capita, in the United States, with 188 homicides in 2015 (59.3 homicides per 100,000) and ranks No. 13 of the most dangerous cities in the world by homicide rate. Detroit, Flint, Michigan, Memphis, Tennessee, Oakland, California, and some smaller cities with fewer than 100,000 population (ex. Camden, New Jersey) have higher overall violent crime rates than St. Louis, when comparing other crimes such as rape, robbery, and aggravated assault. St. Louis index crime rates have declined almost every year since the peak in 1993 (16,648), to the 2014 level of 7,931 (which is the sum of violent crimes and property crimes) per 100,000. In 2015, the index crime rate reversed the 2005-2014 decline to a level of 8,204. Between 2005 and 2014, violent crime has declined by 20%, although rates of violent crime remains 6 times higher than the Crime in the United States and property crime in the city remains 2 times the national average. St. Louis has a significantly higher homicide rate than the rest of the U.S. for both whites and blacks and a higher proportion committed by males. , 7 of the homicide suspects were white, 95 black, 0 Hispanic, 0 Asian and only 1 female out of the 102 suspects. In 2016, St. Louis was the most dangerous city in the United States with populations of 100,000 or more, ranking 1st in violent crime and 2nd in property crime. It was also ranked 6th of the most dangerous of all establishments in the United States, and East St. Louis, a suburb of the city itself, was ranked 1st. The St. Louis Police Department at the end of 2016 reported a total of 188 murders for the year, the same number of homicides that had occurred in the city in 2015. According to the STLP At the end of 2017, St. Louis had 205 murders but the city only recorded 159 inside St. Louis city limits. The new Chief of Police, John Hayden Jr. said two-thirds (67%) of all the murders and one-half of all the assaults are concentrated in a triangular area in the North part of the city.

Answer this question based on the article: What proportion of all the murders and one-half of all the assaults were concentrated in a triangular area in the North part of the city?
two-thirds