CAIRO, Egypt — Egyptian police have detained 200 people for questioning over two attacks on foreign tourists in Cairo and are hunting for the brother of one of the attackers, security sources said yesterday.

Police rounded up the people in the working-class Cairo district of Shubra el-Kheima, home to a man and two women who killed themselves and wounded four foreigners in two separate attacks on tourists Saturday.

The authorities were investigating whether there were more members of a group who say they were behind Saturday's attacks and an April 7 attack that killed three tourists and a bomber in a Cairo bazaar, the sources said.

Ehab Yousri Yassin, Saturday's bomber, wounded the four foreigners and three Egyptians when he blew himself up with a nail bomb near the Egyptian museum, a major tourist attraction.

Police were hunting for Yassin's brother Mohammed, who was present when Yassin's wife and sister opened fire on a tourist bus in another part of Cairo in the second attack, police said.

No tourists were wounded.

Yassin's sister fatally shot his wife and herself. Abdel Karim said Mohammed, who is about 18 years old, fled the scene.

Yassin was a fugitive wanted in connection with the April 7 attack in Cairo, authorities said.

Tourism Minister Ahmed al-Maghrabi said an Israeli couple wounded by the nail bomb were in "decent condition" and would go home. A wounded Italian woman left for Italy, and the three Egyptians left the hospital, officials said. A Swedish man who had undergone eye surgery might be hospitalized for a few more days, Health Minister Mohamed Awad Tag Din said.

Two Islamist groups have claimed responsibility for the attacks in Internet statements, but the authenticity of the statements could not be checked.

Some analysts say the recent violence is a response to the U.S. invasion of Iraq. Security forces strengthened barricades around the U.S. embassy in Cairo.

Authorities said they do not regard the spike in terror attacks as a return to the violence that plagued Egypt during the 1990s. Saturday's drama, they said, resulted from the government crackdown on a small militant cell it says carried out the April 7 attack.

But the opposition Al-Ghad Party said the violence was the result of the "environment of oppression and depression," a reference to the emergency laws the country has lived under since 1981.

Opposition groups are demanding President Hosni Mubarak revoke the laws, which he claims are in place to fight terrorism.