Egyptian security officials say unidentified Gaza gunmen opened fire on Thursday night from across the border on workers installing an underground metal barrier to seal off weapons smuggling tunnels.
The officials say no one was hurt, but some equipment was damaged in the shooting. Hamas border officials in Gaza confirmed shots were fired twice toward Egyptian workers.
All the officials spoke on condition of anonymity because they were not allowed to talk to reporters.
The border project is one of a series of measures Egypt has taken to crack down on smuggling since the end of Israel's Operation Cast Lead last winter.