Israel on Tuesday rejected the findings of a UN report that accused the Israel Defense Forces (IDF) of deliberately firing at UN institutions during the offensive against Hamas in the Gaza Strip earlier this year, saying the report is "biased."

The Israeli Foreign Ministry said in a statement that Israel has held its own internal review of its behavior during Operation Cast Lead that was independent of the UN probe, and "the conclusions of these probes were released two weeks ago and they proved beyond all doubt that there was no deliberate shooting by the IDF at UN facilities."

The ministry also complained about Hamas who "are misleading the investigators, the UN and public opinion."

"Not only do Hamas terrorists not hold such probes, but they also use violence and sow fear among the Gaza residents to intimidate them and prevent them from presenting the truth as is," said the ministry.

UN Secretary-General Ban Ki-moon is expected to submit his reaction over the UN report to the Security Council on Tuesday, according to local daily Ha'aretz.

On April 22, the IDF said in a statement that internal probes found that its troops did not violate international law during the recent warfare in Gaza, which began in late December.

"The investigations showed that throughout the fighting in Gaza, the IDF operated in accordance with international law," said the statement, after five IDF teams concluded their probes into reports of alleged war crimes during the 22-day military offensive.

The investigative units examined claims of attacks at UN facilities, medical personnel and buildings, uninvolved civilians and civilian infrastructure and of the use of weaponry containing phosphorus, according to the statement.

A central operational IDF investigation of the military operation, during which over 1,400 Gazans and 13 Israelis were killed and thousands of buildings destroyed, is still going on and will be concluded by June, said the army.