GAZA CITY, Palestine: Hamas slammed as "immoral" Monday an EU appeal to keep it on the bloc's terror blacklist, a month after a European court ordered its removal.

"The European Union's insistence on keeping Hamas on the list of terrorist organizations is an immoral step, and reflects the EU's total bias in favour of the Israeli occupation," Hamas spokesman Sami Abu Zuhri told AFP.

"It provides it (Israel) with the cover for its crimes against the Palestinian people," he added.

Foreign ministers from the 28 EU member states decided at a Monday meeting to appeal the decision taken by the General Court of the European Union on December 17, the bloc's foreign policy chief Federica Mogherini said.

The ruling by the EU's second highest court had said that the blacklisting of Hamas in 2001 was based not on sound legal judgements but on conclusions derived from the media and the Internet.

Hamas, which has dominated the Gaza Strip since 2007, had appealed against its inclusion on the blacklist on several grounds.

Israel's closest ally the United States has urged the EU to keep up its sanctions on Hamas, saying the U.S. position had "not changed" and Hamas is still a "designated foreign terrorist organization."

Hamas fired thousands of rockets at Israel during a 50-day war last summer in which the Jewish state pounded Gaza with thousands of its own strikes.

The war killed nearly 2,200 Palestinians, mostly civilians, and 73 on the Israel side, mostly soldiers.

The EU ministers were meeting in Brussels to discuss how to boost cooperation in the face of a growing Islamist militant threat following deadly Paris attacks and anti-terror raids in Belgium.