All police officers and other members of the police department shall be and are hereby invested with all the power and authority given to them as peace officers under the laws of the State of Texas in enforcing the criminal and traffic laws of the state and the ordinances of this city within the jurisdictional limits of the city. It shall also be the general duty of all police officers to quell riots, disorders and disturbances of the peace and to take into custody all persons so offending against the public peace. Such officers shall further use their best endeavors to prevent the commission within the city of offenses against the laws of the state and of the ordinances of the city; to observe and enforce all such laws and ordinances; to detect and arrest offenders against the same; to preserve the good order of the city and to secure the inhabitants thereof from violence, and the property therein from injury. Such officers shall have no power or authority in civil matters, but shall execute any criminal warrant or warrant of arrest which may be placed in their hands by the duly constituted authorities of the city. In addition, all police officers shall execute all writs and processes issued from the municipal court of the city.