Thousands of Palestinians took to the streets of Gaza and the occupied West Bank for the fourth Friday in a row in protests against U.S. President Donald Trump's recognition of Jerusalem as Israel's capital.

Palestinian health officials said at least 20 protesters were wounded by live fire, mostly along the Gaza border. An Israeli military spokeswoman said soldiers had shot at "main instigators" who posed a direct threat to the troops and who were trying to damage the border security fence.

The spokeswoman said about 4,000 Palestinians across the West Bank and Gaza, some throwing rocks and fire bombs and setting tyres alight, confronted Israeli soldiers who responded mainly by firing tear gas.

Meanwhile, Israeli tanks and aircraft struck the Gaza Strip.

The military said it targeted posts that belonged to Hamas, the resistance movement that controls the Palestinian enclave.

Trump outraged Palestinians and sparked anger in the Middle East and among world powers with his Jerusalem declaration on Dec. 6, which reversed decades of U.S. policy on one of the most sensitive issues in the Israeli-Palestinian conflict.

Israel considers Jerusalem its eternal and indivisible capital. Palestinians want the capital of an independent Palestinian state to be in the city's eastern sector, which Israel captured in the 1967 Middle East War and annexed in a move never recognized internationally.

Most countries regard the status of Jerusalem as a matter to be settled in an eventual Israeli-Palestinian peace agreement, although that process is now stalled.

A U.N. General Assembly resolution passed on Dec. 21 rejected Trump's Jerusalem declaration. A total of 128 countries voted for the U.N. resolution. Nine opposed it and 35 abstained. Twenty-one countries did not cast a vote.