Dad-to-be killed when gender-reveal device explodes: Police

A 28-year-old father-to-be was killed when a device he was building for his baby's gender-reveal party exploded, authorities said.

The deadly incident took place shortly before noon on Sunday in Liberty, New York, the New York State Police said.

The explosion killed the father-to-be, Christopher Pekny, and injured his brother, 27-year-old Michael Pekny, police said.

The New York State Police and their Bomb Disposal Unit are investigating, police said.

ABC News' Josh Hoyos contributed to this report.