NEW YORK (AP) — Stocks plunged 7% on Wall Street Monday, triggering a trading halt for 15 minutes. The steep drop followed similar falls in Europe after a fight among major crude-producing countries jolted investors already on edge about the widening fallout from the outbreak of the new coronavirus.  Indexes in London and Frankfurt dropped by more than 7%. The benchmark for Italy, where the industrial and financial heartland was put in lockdown, fell 11%. Oil prices are down about 20%, deepening a rout that began when Saudi Arabia, Russia and other producers failed to agree on cutting output. Bond yields sank to new lows.