Washington, Aug 29 (IANS) Three teenagers in the US city of Detroit have been charged with raping a 90-year-old woman, a media report said Sunday.

Maurice Randall, 17, and Anthony Hardy, 18, both of Detroit, were arraigned Saturday along with a 15-year-old Detroit boy whose name is not being released because he’s a juvenile, myFOXdetroit.com reported.

The crime took place Aug 12 on Detroit’s west side. The attack angered residents who started patrolling their neighbourhood with bullhorns urging witnesses to come forward.

Police say more than 200 volunteers played a key role in helping solve the case.

‘I just wonder what type of world we’re coming to – teenagers committing heartless acts,’ said one volunteer.

‘Detroit has a bad mark right now in America but us coming together to catch these three guys it shows we can do a lot more in our community.’