Four law-enforcement officers trapped inside a rural central Indiana home during a standoff were able to escape without injury Wednesday morning, but a gunman remained in the home. A federal agent, two deputies from the Johnson County Sheriff’s Department and one officer from the Franklin City Police Department, were serving a warrant at the home east of Martinsville when shots were fired. They were pinned down for more than two hours before escaping. Family members of the gunman also were able to leave the home. Martinsville schools have been placed on lockdown.