Israel Air Force warplanes bombed two weapons-smuggling tunnels in the southern Gaza Strip early Sunday, shortly after Palestinian militants in the Hamas-ruled territory fired a Qassam rocket into the Negev.
An Israel Defense Forces spokesperson said the air strike was launched in response to the rocket, which struck the western Negev on Saturday, ending a four-week lull in cross-border rocket attacks from Gaza.
Palestinian medical officials said the four local workers sustained light injuries.
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No Palestinian group claimed responsibility for firing the rocket.
Meanwhile, an explosive device detonated on Sunday morning near IDF troops along the Gaza border, causing no casualties or damage.
On Thursday, gunmen opened fire on IDF soldiers near the security fence along the border with Gaza. Troops returned fire, but were unable to confirm if any were hit; no soldiers were wounded in the incident.