Tucson police and members from their SWAT team are serving a search warrant in the 8900 block of East Desert Palm Street.
The warrant is related to a shots fired call that happened earlier today in the 5900 block of South Park, according to Sgt. Kimberly Bay, spokeswoman for the department.
Bay says authorities are investigating the shots fired call as an aggravated assault.
Police have one man in custody from the shots fired call and are now serving a warrant to another suspect related to the case.
SWAT is on scene for the safety of the officers.