May 10 (Reuters) - An ash cloud from a Mexican volcano on Thursday forced the suspension of flights to and from the international airport of Puebla, a major city southeast of Mexico City. The government of Puebla state, of which the city is the capital, said local authorities had ordered the airport to close and would review the situation again around midday. Mexico last month raised the alert level for the volcano Popocatepetl, which lies some 50 miles (80 km) southeast of the capital, after it began pumping out red-hot fragments of rock and ash.