MANAMA, BAHRAIN, OCT. 15 (THURSDAY) -- -- Hundreds of thousands of Iraqis calling for revenge marched through Baghdad yesterday in a funeral procession for 32 victims, most of them children, of an Iranian missile attack on a school. Iran, meanwhile, shelled the southern city of Basra, killing 11 persons, Iraq said.

Early today, an Iranian missile that diplomatic sources believed was a Silkworm, hit a Liberian-flagged oil tanker in Kuwaiti territorial waters.

An Iranian gunboat yesterday ambushed another Liberian-flagged oil tanker in the southern Persian Gulf, shipping sources said. An Iraqi war communique, meanwhile, said its warplanes raided a ship near Iran's main oil-export terminal of Kharg Island in the northern gulf.

The state Iraqi News Agency said hundreds of thousands of people chanting "revenge for Iraq's children" marched in the capital to mourn the 29 children and three adults killed in Tuesday's Iranian missile attack on the school. The news agency said children from the school led the procession, hoisting photographs of their dead classmates.

A senior official of the six-state Gulf Cooperation Council said Tuesday in Abu Dhabi, United Arab Emirates, that the presence of U.S and western naval forces in the gulf were adding to the tension in the region, Reuter reported.

{The remarks by Saif Maskari, the council's undersecretary for political affairs, were the first public criticism by an Arab state official of the U.S. deployment. Maskari, an Omani, said foreign powers had taken advantage of Kuwait's request for oil tanker protection to insert naval forces in the region.}

Washington Post staff writer Helen Dewar reported from Congress:

House Speaker James C. Wright Jr. (D-Tex.) sharply criticized President Reagan for characterizing the 1973 War Powers Resolution as unconstitutional in defending his refusal to invoke provisions that would require approval by Congress for long-term continuation of the Navy's Persian Gulf operation.

Wright accused Reagan of trying to "arrogate unto himself the powers of the courts in deciding what is constitutional and what is not." He added, "The Constitution directs the president to 'take care that the laws be faithfully executed.' It does not say he may distinguish between laws which he likes and finds personally convenient and those which he does not."