Qatar's Emir Sheikh Tamim bin Hamad Al Thani
Qatari Emir Sheikh Tamim bin Hamad Al Thani offered his condolences to Morsi's family and Egyptian people.
"We received with great sorrow the news of the sudden death of former president Dr Mohamed Morsi. I offer my deepest condolences to his family and Egyptian people. We belong to God and to him we shall return," Sheikh Tamim said in a Twitter post.
Malaysia expresses condolences
Malaysia's foreign ministry said it was "shocked and saddened by the sudden death" of Morsi.
"During his tenure as president, Mr Morsi showed courage and moral fortitude in his attempt to lead Egypt away from decades of authoritarian rule and establish true democracy there," Foreign Minister Saifuddin Abdullah said in a statement.
"I would like to extend my deepest condolences to the bereaved family of Mr Morsi and the people of Egypt."
Morsi buried hurriedly in Cairo
Observers on social media decried the apparent haste with which Morsi's burial was carried out.
"The sudden, abrupt and restricted manner in which the Egyptian regime has enforced President #Morsi's burial, raises even more questions regarding the circumstances of his death, and intensifies calls for an independent medical enquiry," Anas Altikriti, founder of The Cordoba Foundation, said on Twitter.
Mahmoud Refaat, a foreign policy advisor at the European Institute for International Law and International Relations, said the burial went against Egyptian tradition.
"In Egyptian tradition, which is considered quite sacred, we bury our dead during daylight hours, either after the duhr (noon) or afternoon (asr) prayers," Refaat said on Twitter.
"It is also done where the dead was born. Forcing Morsi's family to bury him in the middle of the night with only two of his sons present, and without his wife, only confirms that Egypt (authorities) has no honour and is being ruled by the Emirates," he added, referring to the political ties between the government of el-Sisi and the United Arab Emirates.
'Mistreatment of detainees'
There have been reports over the years that Morsi had been mistreated and tortured in jail, with activists saying on Monday his death should be seen in the context of the Egyptian authorities' systematic isolation and mistreatment of political detainees.
Human Rights
"The government of Egypt today bears responsibility for his death, given their failure to provide him with adequate medical care or basic prisoner rights," the group said in a statement to Al Jazeera.
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