An Israeli died Saturday from wounds from a rocket attack fired from Gaza, the Jerusalem Post reported.
At least five others died when Israeli forces launched an airstrike against an Islamist militant training camp in the Gaza Strip, medical officials said, DPA reported.
The Israeli victim was brought to a hospital in Ashkelon, where he died. He was injured by fragments from the missile that hit his house in an apartment building.
Within several hours, Israel was hit by 20 grenades and rockets including Russian-built Grad missiles. Three other Israelis were injured and a school and several residential buildings were hit.
Foreign Minister Avigdor Lieberman warned of serious consequences in the coming days if the attacks do not stop. Three people were wounded in the attack on the al-Quds Brigades base in the southern part of the Strip, a spokesman for emergency medical services said. The Brigades are the armed branch of the radical Islamist movement Islamic Jihad.
An Israeli Army spokeswoman confirmed that a terrorist base in the southern Gaza Strip had been struck. She said launch devices for Grad missiles had been destroyed. Israel has accused the Brigades of firing a similar missile into its territory on Wednesday.
Militant Palestinians routinely fire missiles into Israel. Israeli officials worry the militant groups might eventually have access more precise, destructive missiles.