"According to updated data, there are 19 injured and 29 killed", the source said. The source added that there were 14 employees of the pre-trial detention centre among those 19 persons injured in the incident. They had gunshot and blast injuries.
An investigation into the circumstances of the incident is underway, according to the source.
In April, a similar incident occurred in Venezuela's Nueva Esparta state. One person was killed and two other people were injured after about 60 prisoners escaped from a local jail. The inmates, who seized arms from a guardhouse, attacked and injured two prison guards, local media reported.
Russia, China, Cuba, Bolivia, Turkey and a number of other countries have voiced their support for constitutionally-elected Maduro as the only legitimate president of Venezuela.