Art. 306. Who are brigands; Penalty. – When more than three armed persons form a band of robbers for the purpose of committing robbery in the highway, or kidnapping persons for the purpose of extortion or to obtain ransom or for any other purpose to be attained by means of force and violence, they shall be deemed highway robbers or brigands.
Persons found guilty of this offense shall be punished by prision mayor in its medium period to reclusion temporal in its minimum period if the act or acts committed by them are not punishable by higher penalties, in which case, they shall suffer such high penalties.
If any of the arms carried by any of said persons be an unlicensed firearms, it shall be presumed that said persons are highway robbers or brigands, and in case of convictions the penalty shall be imposed in the maximum period.
Art. 307. Aiding and abetting a band of brigands. – Any person knowingly and in any manner aiding, abetting or protecting a band of brigands as described in the next preceding article, or giving them information of the movements of the police or other peace officers of the Government (or of the forces of the United States Army), when the latter are acting in aid of the Government, or acquiring or receiving the property taken by such brigands shall be punished by prision correccional in its medium period to prision mayor in its minimum period.
It shall be presumed that the person performing any of the acts provided in this article has performed them knowingly, unless the contrary is proven.
link to the complete text of the Revised Penal Code: Philippines-Penal Code-1930-eng