BEIRUT — Fierce clashes broke out Tuesday between Syrian rebels and regime forces battling for control of a border crossing on the frontier with Turkey, and Turkish authorities told residents to evacuate the area.

The violence along the border with Turkey, which is a strong supporter of the rebels trying to oust President Bashar Assad, underlines the regional danger as the Syrian civil war increasingly draws in neighboring countries.

On the diplomatic front, a spokesman for President Mohammed Morsi of Egypt said Morsi told Iran’s foreign minister in a meeting Tuesday in Cairo that relations between the two countries were being hindered by Tehran’s support for Syria’s regime.

Spokesman Yasser Ali said Morsi told the Iranian minister, Ali Akbar Salehi, that as president he cannot ignore the fact that public opinion in Egypt is overwhelmingly against the Syrian regime, which he said ‘‘uses harsh language and violence against people.’’

The two met as part of a Morsi-sponsored Syria peace initiative dubbed the ‘‘Islamic Quartet,’’ bringing together Turkey, Saudi Arabia, and Egypt — all supporters of the Syrian rebellion — with Iran.

Salehi, whose country is a crucial ally to the Assad regime, is traveling to Syria on Wednesday, where he will meet with Assad and other Syrian officials. Iran has provided strong backing to the Syrian leadership since the uprising began in March 2011.

The Turkish official, who spoke on condition of anonymity in line with government rules, said Tuesday that government forces and rebels were engaged ‘‘in very fierce’’ battles near the border crossing of Tal Abyad.

One woman was hit by a stray bullet and hospitalized in the Turkish border town of Akcakale.

The Turkish state-run Anadolu Agency said six Syrians were injured in the clashes and brought across the border for treatment.