Miami-Dade police have nabbed the man suspected of robbing a SunTrust Bank after an off-duty cop alertly took down the tag number of the thief's getaway car.

Both the heist and the arrest occurred Monday, with authorities taking Alejandro Camps, 29, into custody at his home -- a mile from the scene of the crime.

According to the arrest report, here's what happened:

Camps entered the SunTrust branch at 8717 SW 24th St. about 9:45 Monday morning, approached a female teller and gave her a note demanding money.

The teller complied, and Camps fled the bank.

As he was speeding away in a 2006 Cadillac Deville, a Miami-Dade off-duty cop -- identified as Officer Munrano on the report -- got a look at the car's license plate.

A records search led police to Camps' home at 3513 SW 90th Ave., where they found the car in the driveway.

They arrested Camps about 7:30 p.m. and charged him with armed robbery with a firearm.

As of Tuesday afternoon, he was held at the Pretrial Detention Center on no bond.