One was killed and five others were injured in an attack on the headquarters of Muslim Brotherhood (MB) 's Freedom and Justice Party in Egypt's Delta city of Zagazig in Sharqiya governorate, MB's official website reported late Thursday.
In the attack, one student majoring in pharmacy was shot dead, while the other five were seriously injured, the report said.
Zagazig is the hometown of President Mohamed Morsi, who came to power a year ago but now has to deal with the planned nationwide protests against him on June 30 due to his "poor performance", Xinhua reported.
Yasser Mehraz, media spokesperson of the MB, said the opposition is dragging the country into a pool of blood.
He blamed the society's division on Egypt's main opposition bloc, National Salvation Front (NSF), along with the "Rebel" campaign, which has collected over 15 million signatures against Morsi and aims to bring him down.
Mehraz urged all political factions in Egypt to condemn violence ahead of the June 30 protests.
Supporters of Morsi, for their part, called for one-million-man march on Friday, dubbed "No for Violence," to support the legitimacy of the Islamist-oriented president from the MB camp.
But the NSF on Thursday evening urged Morsi "to listen to the voices of the opposition and respond to their demands by holding early presidential election to meet the objectives of 2011 revolution topped by social justice."
"We are confident that millions of Egyptians will flock to the main fields in peaceful protests on June 30 to assert their will and bring their revolution back to its right track," the NSF said in a statement.