Libya’s east-based army rounded up at least 50 people in a coastal city following a prison escape earlier this year, a rights group said Tuesday. Human Rights Watch said in a statement that an armed group affiliated with the self-styled Libyan Arab Armed Forces launched the crackdown after five prisoners escaped from a prison in the city of Derna on Jan. 16. It said the five prisoners were arrested again four days later. But the armed group, Tarek Bin Ziyad Battalion, continued to detain others in the city, including relatives of the five, and former detainees and their families. “Once again, unaccountable LAAF forces resort to brutal tactics to instill fear and terror among Derna residents,” said Eric Goldstein, deputy regional director at HRW. Goldstein called for the release of those arbitrarily detained and for revealing the whereabouts of anyone still in detention. A spokesman for the LAAF was not …