According to leprogresegyptien website, El-Baradei condemned the terrible crime that happened in a village in Giza province on Sunday.
He said such crimes were the outcomes of radical speeches that are on the rise in Egypt.
These speeches are delivered openly and sometimes with direct support from the government and Morsi himself, El-Baradei said.
Mohamed Ghanim, an Egyptian Shia activist had previously noted that the Muslim Brotherhood group, which is in power in Egypt, pays no attention to the security of Shia Muslims and tries only to keep its Salafi comrades content.
Four Egyptian Shias were killed in a mob attack in the village of Zawyat Abu Musalam in Giza on Sunday.
An anti-Shia crowd gathered outside the house where a group of Shia Muslims were meeting. The violence, which included the murder of four Shia residents and the injuring of several others, was captured on video.
Sheikh Hassan Shehata, a local Shia leader, were among the four Shias killed in the attack.
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