CHICAGO — Two people were killed and at least 30 others were wounded in overnight mass shootings in three states, authorities said Saturday, stoking concerns that a spike in U.S. gun violence during the coronavirus pandemic could continue as summer dawns and eased restrictions allow people more freedom to socialize. No one was arrested as of Saturday afternoon in any of the attacks, which took place late Friday or early Saturday in the Texas capital of Austin, Chicago and Savannah, Georgia. In Austin, authorities were searching for two male suspects in an early Saturday shooting on a crowded pedestrian-only street packed with bars and restaurants.