Four Palestinians have been killed and several injured in an Israeli air strike on a car in Gaza City.
Two cars were caught in the strike
A senior militant from Islamic Jihad and three members of a family were among the dead, including a child.
Islamic Jihad said Mohammed al-Dahdouh was one of its senior engineers involved in weapons manufacture.
The Israeli army has struck at militant targets in this way many times before, a BBC correspondent in Gaza says.
The strikes form part of their effort to stop militants from firing rockets into Israeli territory.
For their part, militants often say their attacks are in retaliation for Israeli military action in both Gaza and the West Bank.
In the latest strike, a missile was apparently fired from an unmanned plane into the city centre.
The attack tore apart Dahdouh's car and also caught others travelling nearby.
A grandmother, mother and her four-year-old son were killed.
The Israeli military confirmed an air attack on what it described as a militant target and said Dahdouh was responsible for firing rockets into Israeli towns.
Islamic Jihad vowed revenge for the killing.
Intelligence service blast
The attack came after a day of high tension in Gaza City, which saw the Palestinian intelligence service chief seriously injured in a blast at the organisation's main office, officials said.
At least one person was killed in the blast, which staff working for intelligence chief Gen Tareq Abu Rajab called an assassination attempt.
Correspondents say the incident is set to stoke rising tensions between the rival Hamas and Fatah factions.