A skull has been found abandoned inside a carton in Thakwa village, Kimunyu Gatundu South.
This comes two days after another one with a confession note was found early on Sunday.
The residents who held a demonstration yesterday associate the skulls with witchcraft and now want the authorities to arrest and prosecute the culprits.
"Gatundu Police Station officers have come and carried the skull but that is where it ends," said Njeri Kamau, a resident.
The residents threatened to continue holding demonstrations until the culprit(s) is brought to book.
"That witch had written in her confession that she is the one behind irresponsible drinking by the youth here and not being able to marry. We will not rest till we get them," Lucy Mugure said.
Thakwa Assistant Chief Peter Kimanga expressed his shock by the recent turn of events.
"When the first skull was found on Sunday,I thought that was all but am shocked to hear another one has been found. We will use Nyumba Kumi to trace the suspects," he said.