Five Malawians were killed by mobs that attacked the strangers.
National Police spokesman James Kadadzera told the media that the arrests follow blood sucking myth which Police had probed and had found no tangible evidence to support blood sucking.
He attributed the attacks and killings on jealousy, illiteracy and poverty were some of the drivers that force citizens to take law into their own hands and kill suspected blood suckers.
In Mzimba alone, 27 out of 37 people have been arrested where last week one person was burned for being suspected to be a blood sucker, while another fled with injuries.
Anthology experts say reports of blood-sucking stem from economic hardships and inequalities, or the rich versus the poor.
The thinking is that the poor believe the rich are greedy and suck blood of poor people.