30 plus white circular objects in linear flight in Tucson, AZ sky.

On 5/5/2021 my wife and I witnessed flying objects in the sky.  They were white and circular flying in a linear pattern flying at high speeds. 30 or so of them became in view of the naked eye one by one and were all gone in a matter of 5 minutes.  They had to be flying at high speeds to disappear so quickly.  My wife and I have never seen anything like it.  I typically see satellites orbiting the earth, but nothing compares to what we witnessed last night.  I have a background in finance, while my wife is a registered nurse.