* Explosions kill at least 82, wound 162, diplomat says
* More than 60,000 people dead in 22-month Syria revolt - UN
Syria's U.N. Ambassador Bashar Ja'afari described as "a cowardly terrorist act" an attack on Tuesday that killed scores of students sitting for exams at Aleppo University in Syria's biggest city.
"This act killed 82 students and wounded 162 other students," he told the U.N. Security Council during a debate on counterterrorism. "A cowardly terrorist act targeted the students of Aleppo University."
A Syrian opposition group put the death toll from the two explosions that rocked the university at 83.
The cause of the explosions was not clear but the Syrian government and opposition activists blamed each other.
"The terrorist armed groups in my country always take advantage of a Security Council meeting to perpetrate a terrorist attack inside Syria and this is indeed what happened today perhaps for the 10th or 20th time since the crisis in my country began," Ja'afari told the 15-nation council.
According to the United Nations, more than 60,000 people have been killed during a 22-month-old revolt against Syrian President Bashar al-Assad, which began with peaceful protests but turned violent after Assad's forces tried to crush the demonstrations.
U.N. special envoy for Children and Armed Conflict, Leila Zerrougui, said more than 20 children had been killed and many injured during the past few days in air strikes and other attacks on populated areas in and around Damascus.
"Children pay a very high price in the ongoing fighting. All parties must immediately refrain from targeting civilian areas and take all necessary precautions to protect girls and boys," she said in a statement.
In a letter to the Security Council and U.N. Secretary-General Ban Ki-moon, dated Jan. 9 and released on Tuesday, Ja'afari outlined details of a peace plan put forward by Assad in a speech earlier this month.
Although Assad's speech appeared to dismiss peace talks with his enemies and was rejected by opposition groups, Ja'afari wrote that the government was prepared to enter a national dialogue in a bid to resolve the crisis.
In preparation for such a dialogue, Ja'fari said all countries in the region should stop funding, arming and harboring rebels, while all combatants - government forces and rebel fighters - should adhere to a ceasefire.
He also said "guarantees will be offered to Syrian opposition groups in order that they might enter the country, without conditions, to participate in the national dialogue."
More than 50 countries asked the Security Council on Monday to refer the Syria crisis to the International Criminal Court, which prosecutes people for genocide and war crimes. But Russia - Assad's long-standing ally and a major arms supplier - blocked the initiative, calling it "ill-timed and counterproductive."