Human rights lawyers have filed a court appeal in Berlin seeking to block a 150-metric-ton shipment of military-grade explosives aboard German cargo ship MV Kathrin, which they say is to be delivered to Israel's biggest defense contractor.

The European Legal Support Center said on Wednesday the action was filed on behalf of three Palestinians from Gaza, arguing that the shipment of primarily RDX explosives could be used in munitions for Israel's war in Gaza, potentially contributing to alleged war crimes and crimes against humanity.

Israel denies accusations that it has committed war crimes in the Gaza Strip, saying its forces abide by international humanitarian law while fighting Palestinian militants who operate in densely populated civilian areas.

German-based Lubeca Marine, which owns the MV Kathrin, said the ship "was never scheduled to make any port calls in Israel" and had recently discharged its cargo, originally destined for Bar, Montenegro, without disclosing where the discharge took place.

The company declined to disclose details of the cargo for contractual reasons, but said it complied fully with all international and EU regulations, ensuring necessary permits are obtained before any operations.

The ELSC said the RDX shipment was destined for Israeli Military Industries, a division of Elbit Systems, Israel's largest defense contractor. Elbit Systems declined to comment.

"We never claimed that the Kathrin was bound for Israel [itself], it's the cargo which is bound for Elbit Systems," ELSC lawyer Ahmed Abed told Reuters regarding the group's appeal filed at Berlin's Administrative Court. "The company ignored all the warnings."

LSEG data and vessel-tracking website Marine Traffic indicated that the MV Kathrin had docked in the major Egyptian Mediterranean port of Alexandria on Monday and was last seen there.

According to the port of Alexandria's website, the ship, which it identified as German, unloaded military equipment in Alexandria and was set to depart on Nov. 5.

Egypt's army denied in a statement reports of assisting Israeli military operations, saying that "there isn't any kind of cooperation with Israel."

The Egyptian ministry of transport also said late on Thursday that the ship docked in Alexandria to unload a shipment for Egypt's ministry of military production, adding that the ship submitted an official request to leave to Turkey.

The MV Kathrin has been denied entry at several African and Mediterranean ports, including in Angola, Slovenia, Montenegro, and Malta, according to the ELSC. It said Portuguese authorities recently required the ship to switch from a Portuguese flag to a German flag before it could continue.

In August, Namibian authorities blocked the vessel, which departed from Vietnam's port of Haiphong, from entering its main harbor, Amnesty International has reported.

Germany's economy ministry, named in the case because the ship is German-owned and flagged, said it had received letters from lawyers on the matter but declined to comment on them.

The ministry said the MV Kathrin shipment did not constitute an export from Germany, as the explosives were neither loaded nor dispatched from German territory. It said there was no legal basis for requiring an export license under German law.