Many of the Jama'atul Mujahideen Bangladesh (JMB) men convicted in the August 17, 20005, series bomb blast cases walked out of prison after serving their jail term and it remains a big challenge for law enforcers to keep them under surveillance, say Counter Terrorism and Transnational Crime (CTTC) officials, reports The Daily Star on August 17. On August 17, 2005, around 500 bombs went off at 300 locations in 63 out of the 64 Districts across the country. The bombs exploded in half an hour from 11:30am. JMB, a banned militant outfit, carried out the attack and claimed responsibility for it. Some 159 cases were filed in connection with the attack. Investigators pressed charges against 1,072 militants in 142 of the cases. Final reports were placed in the rest 17 cases. According to Police Headquarters statistics, 322 accused were convicted while 358 were acquitted till September last year. As many as 133 accused were on bail. The rest are still facing trial.