Tokyo ? Global stock markets extended their shakeout into a second day today, plunging amid worries that a possible U.S. recession will cause a worldwide economic slowdown. The dramatic declines were expected to spread to Wall Street, where stock index futures were already down sharply hours before the trading day began.

Japan’s Nikkei 225 index, the benchmark for Asia’s biggest bourse, skidded 4.4 percent in morning trading to 12,738.31 points, after dropping 3.9 percent Monday. Hong Kong’s Hang Seng index was down 5.2 percent after plunging 5.5 percent the day before.

“Unless we get some positive ‘shock effects,’ such as drastic measures from the U.S. government, there is almost no hope for a recovery in stocks,” said Koji Takeuchi, senior economist at Mizuho Research Institute in Tokyo.

U.S. markets were closed Monday for a holiday commemorating civil rights leader Martin Luther King Jr. But Wall Street future prices were down sharply, portending a plunge when trading begins at 8:30 a.m. Central time.