WASHINGTON (AP) — The mail-bomb scare widened Thursday as law enforcement officials seized three more suspicious packages — two addressed to former Vice President Joe Biden and one to actor Robert De Niro — as part of a sprawling investigation into a plot that appears to be aimed at targets of conservative anger. The new devices were described as similar to crude pipe bombs sent to former President Barack Obama, Hillary Clinton and CNN. They brought to at least 10 the number of suspicious packages intercepted by authorities this week. Each was addressed to a prominent critic of President Donald Trump.