Human Rights Watch said on Monday that Israel has been barring foreign researchers from entering the Gaza Strip to document abuses.

In a 47-page report, the human rights group said Israel has been “systematically” preventing researchers from visiting Gaza since 2008.

The group also said that Egypt has prevented researchers from entering Gaza Strip from its territory since 2012.

Since Hamas resistance movement took over Gaza in 2007, Israel and Egypt imposed a blockade on the territory. Israel and Hamas have fought three wars since then.

Human Rights Watch says Israeli restrictions casts doubt on its investigations.

“If Israel wants the ICC prosecutor to take seriously its argument that its criminal investigations are adequate, a good first step would be to allow human rights researchers to bring relevant information to light,” said Sari Bashi, Israel and Palestine advocacy director at Human Rights Watch.

The report also slammed Egypt for barring access to Gaza.

The report came more than a week after Hamas said the Israeli regime has assassinated one of its senior members in the besieged Gaza Strip.

“Hamas and its (military wing) hold (Israel) and its collaborators responsible for this despicable crime,” Hamas said in a statement hours after gunmen shot dead Mazen Fuqaha.