The first incident happened Friday just before midnight.
Authorities said citizens called police with the description of three suspects involved in a robbery at the Kangaroo convenience store in the 5700 block of Ramsey Street.
Based on the description, police stopped a grey jeep and found clothing, money, and a handgun inside the vehicle that matched the ones used during the crime.
They charged 19-year-old Cornelius Fowler, 18-year-old Kristopher Stewart and a 16-year-old with robbery with a dangerous weapon and conspiracy in connection with the robbery. Fowler is also charged with possession of firearm by a felon.
All three suspects received a $25,000 secured bond and are currently being held at the Cumberland County Detention Center.
In the second incident, police took four teens into custody after a person living in the 400 block of Dunmore Road heard an alarm going off at a home around 3:45 p.m. Saturday.
Authorities said the neighbor called 911 and gave a description of the suspects.
Officers later arrested two 17-year-olds, a 16-year-old, and a 15-year-old in connection with the attempted breaking and entering. Because of the ages of the suspects, their names are not being released.
Officials said they may not have caught the suspects as quickly as they did if it was not for the vigilance of the community.