Qatar has denied the allegations.
Amid a simmering row between Qatar and some of its neighbors, the Iranian Foreign Ministry on Monday renewed its call on the regional countries to show self-restraint and resolve their disputes through negotiation. "Pakistan believes in unity among Muslim states and has made serious efforts for its promotion", said foreign office spokesperson Nafees Zakaria.
Turkey has declared its full support to Qatar by offering food supplies and deploying its military troops in Qatar. However, this scattershot approach to foreign policy has not remained unnoticed: "Qatar can't be an American ally on Monday that sends money to Hamas on Tuesday", John Kerry, then a United States senator, said in 2009.
Saudi Arabia is not a signatory to the convention.
Turkey has sent food and dairy products to Qatar to help break the Saudi-led blockade on the country.
Saudi Arabia, the United Arab Emirates, Bahrain and Egypt cut diplomatic ties with Qatar last week, accusing it backing terrorism and promoting policies that destabilize the region.
Erdogan added he would hold three-way phone talks on the crisis later Tuesday with French President Emmanuel Macron and Qatar's emir, Sheikh Tamim bin Hamad Al-Thani.More news: Tower Block Fire Survivors Storm London Town Hall
Erdogan urged the king of Saudi Arabia, Salman bin Abdulaziz al-Saud, to take a leading role in resolving the ongoing Gulf crisis with Qatar. Oman has stayed out of the conflict.
Erdogan said Qatar had fostered stability and was a key actor in fighting the "Islamic State" (IS).
"Victimizing Qatar through smear campaigns serves no goal", Erdogan said, urging the Saudi king, as an elder politician in the region, to take the lead in untangling the crisis.
Pakistan's Prime Minister Nawaz Sharif has expressed hopes for a swift resolution of the crisis engulfing the energy-rich nation of Qatar.
Saudi Arabia and Iran have clashed over several issues, including Iran's nuclear program and what Saudis see as Tehran's growing influence in the region - especially in Syria, Lebanon and neighboring Yemen.
In a phone conversation with the Saudi king, the Russian leader cautioned against anti-Qatar measures.