Israeli helicopters have fired missiles at two Palestinian-owned workshops in the Jabalya refugee camp and in Gaza City.
Helicopters shot at least one missile at a foundry in Jabalya, north of Gaza City, witnesses said. Four people were hurt in the attack last night.
A short time later Israeli helicopters fired missiles at a metal workshop in the Zeitoun neighourhood of Gaza City, wounding two people.
The Israeli military has declined to comment on the strike.
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The Israeli airforce has attacked metal workshops in Gaza in recent days where officials claim Palestinian militants have made rockets used in attacks on Israeli towns near the Gaza Strip.