Officers were on the scene of the second gunfire incident in three days in The Port neighborhood, police said Friday night.

They had responded to a report from ShotSpotter technology, which listens for gunfire, at Windsor and Harvard streets, police said by email at 9:16 p.m. There have been no victims found so far, but officers did find a shell casing.

That’s similar to what happened at around 3:30 p.m., Wednesday on the 100 block of Cherry Street between Harvard and Washington streets – roughly a block away. Work on that case continues, but police said Friday that one person has been arrested on outstanding warrants following a preliminary investigation.

Before Wednesday, the last such incident of many over recent years – with shell casings found after gunfire in The Port, but no victim – was Dec. 21 on Harvard Street near Davis and Portland street

People with information about the Wednesday incident are asked to call Cambridge Police at (617) 349-3300. Anonymous reports can be left on the Cambridge Police MyPD mobile app; or sent by text message to 847411 – just begin your text with TIP650 and type your message.

This post may be updated.