Hamas chief backs International Criminal Court bid

Leader says Hamas agrees in writing to support Palestinian bid at International Criminal Court

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A Palestinian boy, along with supporters of Hamas, holds a representation of a rocket as others shout slogans to protest against Israel and to support people in Gaza, during a demonstration in the West Bank city of Ramallah, Friday, Aug. 22, 2014. (AP Photo/Majdi Mohammed)

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One of the Palestinian protesters prepares to throw a stone as they face Israeli soldiers to protest against the Israeli military action in Gaza, during clashes in the West Bank city of Nablus on Friday, Aug. 22, 2014. (AP Photo/Nasser Ishtayeh)

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A Palestinian protester runs away from Israeli soldiers during clashes, following a protest against the Israeli military action in Gaza, in the West Bank city of Nablus on Friday, Aug. 22, 2014. (AP Photo/Nasser Ishtayeh)

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A Palestinian protester uses a slingshot to shoot a stone towards Israeli soldiers during clashes, following a demonstration against the Israeli military action in Gaza, in the West Bank city of Nablus on Friday, Aug. 22, 2014. (AP Photo/Nasser Ishtayeh)

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Palestinian protesters run away from Israeli soldiers during clashes, following a demonstration against the Israeli military action in Gaza, in the West Bank city of Nablus on Friday, Aug. 22, 2014. (AP Photo/Nasser Ishtayeh)

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Palestinians chant Islamic slogans while carrying the body of Ibrahim Hamad, an Islamic Jihad militant, during his funeral in Rafah refugee camp in the southern Gaza Strip on Friday, Aug. 22, 2014. Hamad was killed in an Israeli strike while riding a motorcycle Thursday night in Rafah, according to Gaza health official Ashraf al-Kidra. (AP Photo/Hatem Ali)

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Palestinians chant Islamic slogans while carrying the body of Ibrahim Hamad, an Islamic Jihad militant, during his funeral in Rafah refugee camp in the southern Gaza Strip on Friday, Aug. 22, 2014. Hamad was killed in an Israeli strike while riding a motorcycle Thursday night in Rafah, according to Gaza health official Ashraf al-Kidra. (AP Photo/Hatem Ali)

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Smoke and dust rise after an Israeli strike hits Gaza City in the northern Gaza Strip, Friday, Aug. 22, 2014. The air strike came as Israeli Prime Minister Benjamin Netanyahu warned Hamas would pay a ``heavy price

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Smoke and dust rise after an Israeli strike hits Gaza City in the northern Gaza Strip, Friday, Aug. 22, 2014. The air strike came as Israeli Prime Minister Benjamin Netanyahu warned Hamas would pay a ``heavy price

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A ball of fire rises following an Israeli air strike on a building in Gaza, in the northern Gaza Strip, Friday, Aug. 22, 2014. The airstrike came as Israeli Prime Minister Benjamin Netanyahu warned Hamas would pay a ``heavy price

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Palestinians receive treatment from their injuries at the emergency room of the Shifa hospital following an Israeli airstrike in Gaza City, Friday, Aug. 22, 2014. Friday

Mideast Israel Palestinians

Palestinians receive treatment from their injuries at the emergency room of the Shifa hospital following an Israeli airstrike in Gaza City, Friday, Aug. 22, 2014. Friday

Mideast Israel Palestinians

Palestinians receive treatment from their injuries at the emergency room of the Shifa hospital following an Israeli airstrike in Gaza City, Friday, Aug. 22, 2014. Friday

Mideast Israel Palestinians

Palestinians receive treatment from their injuries at the emergency room of the Shifa hospital following an Israeli airstrike in Gaza City, Friday, Aug. 22, 2014. Friday

GAZA CITY, Gaza Strip (AP) -- A senior Hamas leader says the group signed a pledge to back any Palestinian bid to join the International Criminal Court. Such a step could expose Israel -- as well as Hamas -- to war crimes investigations.

Moussa Abu Marzouk wrote on his Facebook page early Saturday that "Hamas has signed the paper" of support Palestinian President Mahmoud Abbas requested before joining the court.

Hamas official Izzat Rishq confirmed the document was signed. Abu Marzouk's post was reported on Hamas news websites. There was no comment from Abbas aides.

Abbas has weighed joining the court, but linked it to Hamas support. Accepting its jurisdiction could lead to war crimes investigations of Israel for its actions in the Gaza war. Hamas could be investigated for its indiscriminate rocket fire at Israel.