Cairo, Egypt (CNN) -- Mohamed ElBaradei, an Egyptian presidential candidate and Nobel laureate, was attacked by thugs at a polling station in Cairo on Saturday, his brother told CNN.
ElBaradei described the attack, which occurred during a referendum on changes to the constitution, on his Twitter account.
Went 2 vote w family attacked by organized thugs, he tweeted. Car smashed w rocks. Holding referendum in absence of law & order is an irresponsible act.
The former head of the International Atomic Energy Agency also tweeted that two members of his campaign team were detained at a separate polling station in Cairo.
ElBaradei said the two women were serving as official monitors at the polling station when they were detained.
Disgusting, ElBaradei said in another tweet.
His brother confirmed the attack. Egyptians streamed to the polls Saturday to vote on proposed constitutional amendments, the first democratic initiative after the fall of autocratic president Hosni Mubarak's regime.
Mr. Mohamed ElBaradei's car was attacked by thugs who threw rocks at it and prevented him from entering the Mokatam voting poll, Ali ElBaradei told CNN. He did not vote today.
The attackers also chanted slogans against him, the brother said.
A military official told CNN he was not aware of the incident.
We have been on the ground all day securing the polls along with the police and with the aid of the neighborhood watch groups too, said Major Alla al Iraqi of the military's press office. There have not been any incidents of violence or clashes. Any minor arguments I witnessed between those who were voting yes or no were resolved between one another. Today, has been a model for democracy.
