Papers in the Middle East express horror at the attacks in the Red Sea resort of Taba.
But many link the violence squarely to Israel's latest military actions in Gaza.
Palestinian papers predict that Egypt will be forced to re-examine its policies in the region in response.
The terrorist acts in Sinai and other places confirm what Egypt said when it warned against the failure to resolve the problems of the Middle East, particularly the Palestinian question and the occupation of Iraq.
It is not strange that against this backdrop of pictures of the blood of victims in Palestine, Iraq and other countries, violence and terrorism extend elsewhere, even to the peaceful coast of southern Sinai.
The Taba massacre looks like a geographic and military extension of the one taking place in Gaza... What happened in Taba serves the Israeli government's basic interests because it never reacted positively to Egyptian efforts to organise the internal situation in Gaza... This operation has frozen Egypt's peace efforts and has directed them towards a new aim: fighting terrorism.
Hafith al-Barghuthi in Palestinian Al-Hayat al-Jadidah
As a result of the Sinai explosions, tourism will experience a sharp but transient drop and Israeli trust, already weak, in Egypt's role to secure the Israeli pullout from Gaza will also shrink.
Hasan al-Batal in Palestinian Al-Ayyam
We say frankly: at no time have we ever wanted to see the wholesale deaths of Israelis at a holiday resort as... a source of comfort for large segments of the Arab and Islamic public.
Adli Sadiq in Palestinian Al-Hayat al-Jadidah
The explosions... came after a bloody week resulting from the Israeli aggression in the Gaza Strip in which about 100 people died... the Middle East is in the midst of a horrible and bloody whirlpool in which most of its victims are civilians... The only way out is an end to Israel's occupation.
People were born to live not to be killed needlessly because of acts committed by others. Our bodies shiver with fear when we see the innocent being killed needlessly in Fallujah, Jabalyah and Taba.
The coincidence of the Sinai bombings with [Israeli Prime Minister Ariel ] Sharon's open massacres in north Gaza and Bayt Hanun has directed accusations against Palestinian factions confronting the Israelis.
Muhamd Kharub in Jordan's Al-Dustur
The scenes of blood and of the dead and wounded are not, of course, ones which any human being would like but analysis clearly indicates they are related to what is happening in Palestine and what is being done by the Israelis to the Palestinian people.
The bombings witnessed in Sinai are not the type of bombings carried out by the Palestinian resistance factions against Israeli targets but they cannot be separated from what is happening in the occupied Palestinian territory and the negative stance of the international community towards ending Israel's violations against Palestinian territory.
The Taba incident showed that the fight against Zionism and the hatred towards it are still a reality in Egypt. It showed that those who killed the former Egyptian leader Anwar Sadat in 1981 for his betrayal and succumbing to criminal Israel are still active in Egyptian society and are trying to be effective. Especially when this incident coincided with the anniversary of the other incident [Sadat's assassination].
Iran Jomhuri-ye Eslami
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.