IN PERU'S LATEST wave of guerrilla violence, leftist rebels have dynamited at least a dozen banks in different areas of the capital, police said. Six people were reported wounded . . . JAPAN SAID ITS unemployment rate had fallen to 2.1 percent, the lowest level in 10 years, reflecting long-running economic expansion . . . A MODERATE EARTHQUAKE hit northwest of Anchorage, Alaska, early Friday, causing power outages in that city, officials said . . . SOME 200 POLICE OFFICERS stormed the Bronx Community College campus early Friday and arrested 19 students accused of defying a judge's order to vacate a school building. The arrests were the first since students began occupying City University of New York campuses on April 8 to protest proposed tuition hikes.