The bombs, packed in a steel cover, were first spotted by children who were digging a pit while playing in a vacant compound area on Monday evening, police said.
Police soon recovered the bombs and shifted the explosives to the Marad police station, which was set up in the area coming under Beypore panchayat limits following the 2003 violence.
The raids by six police teams, led by Assistant Commissioner Jayachandran began at 8.45 am to ascertain if more explosives were hidden in the area, the sources said, adding search operations would be held throughout the day.
The fresh seizure assumes significance as a round-the-clock vigil is being maintained in the area for quite some time now and raids had been conducted from time to time to instill confidence among the people and to ensure peace in the area.