The first happened at Valley Park just after 11 p.m. Wednesday.
The two victims say a car pulled up and two men got out, one with a gun.
They stole headphones, cell phones, shoes, earrings and hookah pipes.
The thieves drove away.
The second happened about two hours later on Versailles Road at around 1 a.m. Thursday when police say the suspect jumped out of a car with a gun.
They say the victim in this case handed over his wallet, his shirt and the tacos he was carrying.
Then, at 1:45 a.m. on Red Mile Road, police answered an attempted robbery call.
They say a man was locked out of his apartment, waiting for a key to get in, when he was approached by a man with a gun.
Police say the victim was forced to get on the ground and the suspect searched him.
When he found nothing on the victim, he ran off.
Police do not believe the crimes are related.