The Israel Defense Forces ended its operation in the northern Gaza Strip overnight Tuesday.
Four Qassam rockets fired from Gaza landed in Nativ Haasara, Sderot and Ashkelon. A Thai worker was injured by a rocket that hit greenhouses in Netiv Haasara.
The army said 20 Palestinian gunmen were injured in the operation.
The Engineering Corps carried out a number of missions in the area and wanted terror suspects were arrested. Troops confiscated automatic rifles and ammunitions.
The incursion was accompanied by heavy artillery fire and the air force helicopters hovered overhead.
Artillery batteries and navy gunboats bombarded launching pads in the north and south of Gaza.
100 gunmen killed
The army said its activities in Gaza are aimed at quelling terror threats from Gaza and creating the right conditions for the rescue of Corporal Gilad Shalit.
Officers estimate that terror groups in Gaza will be more motivated to carry out attacks against soldiers while the operation in Lebanon continues.
"The connection between the fronts fuels the will of terror groups to weaken the IDF as it is operating with great force," a senior officer told Ynet.
Over 100 terrorists have been killed since Israel launched its operation in Gaza three weeks ago on June 25 when Shalit was kidnapped and two members of his tank crew were killed.
Shmulik Haddad contributed to this report