Wall Street advances at end of blistering week

(Reuters) - Wall Street's main stock indexes rose more than 1% on Friday, as dramatic intervention by U.S. policymakers halted the worst monthly selloff in U.S. equities in three decades. The measures unleashed by the White House and the central bank have injected a note of optimism in the markets, after weeks of steep declines that ended a record 11-year bull run.The tech-heavy Nasdaq jumped more than 2%, propped up by heavyweights Microsoft , Amazon and Apple , while airlines gained 4.5%..