Kuwait requested on Friday an urgent Arab foreign ministers meeting to discuss "the deteriorating situation" in the Gaza Strip, its Arab League representative said, as Israeli air strikes pound the Palestinian enclave.

Israel's aerial military campaign targeting rocket-firing militants in Gaza has killed around 110 Palestinians since it began early Tuesday.

Prominent Kuwait opposition leader Mussallam al-Barrak sent a defiant message to the government hours after he was released from jail saying protests will continue in the oil-rich Gulf state.

"Putting us in jail will only strengthen our determination," Barrak told an opposition rally Monday night near the central prison where a number of activists are still detained.

A Kuwaiti court freed prominent opposition leader Mussallam al-Barrak on Monday after police fired tear gas and stun grenades to disperse a fifth straight night of demonstrations demanding his release.

Judge Ahmad al-Athari said he was releasing Barrak on a bail of 5,000 dinars ($17,800), triggering jubilation among supporters of the former MP in the small, jampacked courtroom.

Kuwait riot police on Sunday fired tear gas and stun grenades to disperse hundreds of opposition protesters who were demanding the release of a detained opposition leader.

Witnesses said riot police in armoured vehicles fired tear gas and stun grenades at the protesters as soon as they marched toward a courts complex in the capital Kuwait City, forcing them to flee.

Kuwait's emir consulted with his crown prince and prime minister after four nights of clashes over the arrest of a prominent opposition leader ahead of a mass rally later Sunday.

"The prime minister briefed the emir and the crown prince of the events that violate the constitution and the law," said an official statement cited by the state news agency KUNA.

Police in Kuwait warned Friday they will deal firmly with any violence by protesters after two nights of confrontations with activists demanding the release of a detained opposition leader.

"The interior ministry affirms that any form of violence or riot will be dealt with firmly... and will continue to prevent such practices by using force," a ministry statement said.

Kuwaiti police fired teargas and stun grenades to disperse an opposition rally demanding the release of prominent dissident Mussallam al-Barrak, activists said on Thursday.

The public prosecutor on Wednesday ordered Barrak, a former MP, to be held for 10 days after he was questioned for allegedly insulting the judiciary.

Kuwait's public prosecutor on Wednesday ordered opposition leader Mussallam al-Barrak to be held in custody for 10 days after he was questioned for allegedly insulting the judiciary, his lawyer said.

"The public prosecutor decided to detain Barrak for 10 days pending further investigation," one of the ex-MP's lawyers, Thamer al-Jadaei, told AFP.

Kuwait said on Sunday it is sending urgent humanitarian aid to thousands of Iraqis who have been displaced by ongoing fighting in the neighboring Arab country.

"The council of ministers decided to send urgent humanitarian aid to Iraqis who have been displaced as a result of deteriorating security situation," the cabinet said in a statement.

Kuwaiti voters elected pro-government candidates to replace five opposition lawmakers who resigned two months ago in by-elections that saw one of the lowest turnouts in the emirate's history.

The results will boost the grip of the government on the 50-seat parliament where it already enjoyed a comfortable majority.