Eight Palestinians, including two children and three women, were injured this week by rockets fired in populated areas across the Gaza Strip, a human rights group charged Wednesday.

The Palestinian Center for Human Rights says a woman was seriously injured.

After one incident, according to the PCHR, an ordinance disposal unit arrived at the scene and collected the rocket's shrapnel, but the civil police never showed up to investigate.

The group called on concerned authorities "to investigate these incidents, to take necessary measures to ensure the non-recurrence of such incidents and to provide protection to civilians."

According to the PCHR, four attacks since Friday injured civilians in Rafah, Jabaliya, and Gaza City.

The most recent incident was early Monday, the rights group said. A rocket landed on a house belonging to Sobhi Shakhsa, 53, in the east of Gaza City. Three of his sons were treated for shock.

Samar Sheikh, 28, was seriously wounded by shrapnel to the pelvis and back, and was admitted Sunday into the intensive care unit at Shifa Hospital. Her young brother was also hurt.

A day earlier, 16-year-old Sad Salhi and Naheda Salem, 53, were evacuated from Jabaliya to Shifa, where they were treated for various shrapnel wounds caused by a rocket.

On Friday, Abdul Sattar Abu Snaima, 21, was wounded by shrapnel when a rocket landed in front of his house. He was treated at a hospital in Rafah, according to the group.

A UN report, meanwhile, says a Palestinian child, 13 years old, died and six others were injured when a Grad rocket fired by a Palestinian armed group fell short in Gaza City.

The report contradicts health ministry officials who said Mahmoud Abu Samra died in an Israeli airstrike on his home near a former intelligence services headquarters in the city.

Six rockets were fired into Israel on Wednesday amid airstrikes that killed two Palestinians in Rafah and Gaza City, one of them an operative in Islamic Jihad's military wing, medics and witnesses said.