Police in Montgomery County arrested a man Friday afternoon who is a suspect in the fatal shootings of a man at a mall in Bethesda and a woman at a grocery store in Aspen Hill, and is believed to have killed his estranged wife outside a Prince George’s County school on Thursday. The arrest of Eulalio Tordil, 62, a federal police officer, ended a manhunt that began Thursday and forced authorities to put Montgomery County schools, government buildings and retail establishments on lockdown. Three other people were wounded in the attacks. Police said Tordil was arrested after a brief pursuit...