Friday's Arabic press raises questions in the wake of the attacks earlier in the week on Western targets in Saudi Arabia.
Saudi papers urge concerted efforts both at home and abroad to counter the terrorist threat. Elsewhere, editorials worry there is more to come.
The post-war situation in Iraq and the Arab-Israeli conflict are also on the media's agenda.
Facing this terrorist act, our nation stands united to face this perverted trend.
Al-Watan - Saudi Arabia
Terrorism is not confined to a random operation here and there. It is something which will recur again and again... The struggle against terrorism needs the strengthening of the security mechanism in every single country as well as mass international co-operation.
Al-Jazeera - Saudi Arabia
Despite the Saudi kingdom's firm control over security in all its territories, terrorism still succeeded in trespassing across its borders.
Al-Watan - Kuwait
US Defence Secretary Donald Rumsfeld has urged the Saudis to co-operate in curbing terrorism. He said the Saudis were "positive and co-operative" in their role.
Al-Hayat - London-based
There is no doubt: Tuesday's incident in Riyadh needs efforts from Muslim leaders in all parts of the Muslim world to take decisive actions to combat terrorism.
Al-Sharq al-Awsat - London-based
The Saudi ruling family will wage war against terrorism, acting under US pressure, but there is doubt as to whether it will come out victorious... It is a hard battle to win.
Al-Quds Al-Arabi - London-based
The attack on Iraq will produce hundreds and hundreds of Bin Ladens!
Al-Ra'y - Jordan
Nowadays we can say that the world is governed by the law of the jungle, not by international law or respect for human rights.
Al-Akhbar - Egypt
The world is now governed by imperialistic rules set by the "evil emperor" in Washington and followed by a small Israeli empire controlling Arabs in the east.
Al-Wafd - Egypt
"Leave Iraq to the Iraqi people." This was the slogan chanted by Ayatollah Muhammad Baqir al-Hakim in front of thousands of people demonstrating in Basra and welcoming him after 23 years' absence from Iraq.
Al-Nahar - Lebanon
The crucial question is now whether the US will exert any pressure on the Israeli Government to accept the road map or whether this project will fail as others did in the past because of Israel.
Al-Dustur - Jordan
BBC Monitoring, based in Caversham in southern England, selects and translates information from radio, television, press, news agencies and the Internet from 150 countries in more than 70 languages.