REPUBLIKA.CO.ID, CAIRO - Egypt stepped up pressure on the Muslim Brotherhood a day after declaring it a terrorist group, using the new classification to detain dozens of its supporters on Thursday, while one person died in street clashes ignited by political tension.

A bomb blast in a Cairo suburb wounded five people - the second attack this week after a suicide bomber killed 16 people north of the capital on Tuesday. Army chief Abdel Fattah al-Sisi, who led the overthrow of President Mohamed Mursi in July, said Egypt would be "steadfast" in the face of terrorism.

The move gives the authorities wider scope to crack down on the movement that propelled Mursi to the presidency 18 months ago but has been driven underground since the army deposed him following mass protests against Brotherhood rule.

In Washington, US Secretary of State John Kerry called Egyptian Foreign Minister Nabil Fahmy and "expressed concern" about the terrorist designation of the Muslim Brotherhood and recent detentions and arrests in Egypt, State Department spokeswoman Jen Psaki said.

Kerry condemned the bomb attacks but "underscored the need for an inclusive political process across the political spectrum that respects the fundamental human rights of all Egyptians in order to achieve political stability and democratic change," Psaki said.

The Cairo bomb, which blew windows out of a bus, appeared to be the first aimed at civilians in a recent wave of attacks. But there was no claim of responsibility to say what had been targeted. A second device found nearby was defused.

The government declared Mursi's Muslim Brotherhood a terrorist group on Wednesday in response to the suicide attack that targeted a police station a day earlier in the city of Mansoura. It accused the group of carrying out the bombing, despite Brotherhood condemned it.

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