Santa Clara, Calif. -- ShotSpotter, a Santa Clara-based developer of gunshot location systems and technology used by public safety and the military clients, said on Tuesday that it has raised $7.5 million in its fourth round of funding. The Westly Group led the round, which also included participation by Norwest Venture Partners, Broidy Capital Management and previous investors Labrador Ventures, Levensohn Venture Partners and Claremont Creek Ventures. The company will use the new capital to fuel its market expansion both domestically and internationally. Twenty-nine U.S. cities use ShotSpotter's systems to detect and locate gunfire. The systems also create audio files of the event and capture information that can be used in subsequent investigations and criminal prosecutions.