Iraq has modified a US military plan to protect a Sunni enclave in Baghdad with high concrete walls, and is using barbed wire and smaller cement barriers instead, an Iraqi military spokesman said today. The move to alter the controversial project follows an order from Shia Prime Minister Nuri al-Maliki to halt construction of the 5-km (3-mile) wall around Adhamiya, a Sunni Arab area surrounded on three sides by Shia communities.