A new report says 17 of the nation's 50 largest cities had high school graduation rates lower than 50 percent.
It says the lowest graduation were reported in Detroit, Indianapolis and Cleveland.
The report issued by America's Promise Alliance found that about half of the students served by public school systems in the nation's largest cities receive diplomas.
Researchers say students in suburban and rural public high schools were more likely to graduate than their counterparts in urban public high schools.
In Detroit's public schools, 24.9 percent of the students graduated from high school, while 30.5 percent graduated in Indianapolis Public Schools and 34.1 percent received diplomas in the Cleveland Municipal City School District.