Israeli soldiers entered Gaza and clashed with militants today, the first incursion into the territory since a ceasefire was declared last November.
Palestinian security sources said two Palestinians were injured, one of whom was subsequently arrested by Israelis.
It follows a call by Israeli Defence Minister Amir Peretz for the army to take decisive action against Gaza militants to halt the firing of homemade rockets.
On 28 March, Israel launched a first strike against Palestinians firing rockets from northern Gaza after a four-month stoppage. No soldiers entered Gaza during that strike.
A handful of senior Israeli intelligence and military officials have warned in recent weeks that Gaza's militants are rearming themselves with weapons smuggled from Egypt and called for military action.