Police arrested a resident of Bet Shemesh on Wednesday night on suspicion of being linked to a poster portraying Jerusalem police chief Cmdr. Niso Shaham in a Nazi uniform.
The suspect is the third to be taken into custody on suspicion of incitement to violence over the poster.
Last week, two residents of Bet Shemesh, aged 26 and 55, were arrested.
The police's national police unit for Serious and International Crimes is leading the investigation.
The flyer, which was distributed to mailboxes in haredi (ultra-Orthodox) areas in Jerusalem, shows Shaham’s head pasted onto a photo of Hitler, with the words, “Adolf Nisso Shaham – Genocide!” and “We made it through Hitler, and we will make it through his successor.”
Melanie Lidman contributed to this report