The 2002 scare. In 2002, there was a similar vampire scare. Several people were executed at the hands of lynch mobs, suspected of being witches or vampires.
Social media. It's been reported that footage of several of the executions have been shared online. In one such video posted on Facebook, the condemned man is lying on the ground with his arms and legs tied. A crowd, surrounding him, pelts the man with rocks.
The police. The police in Malawi have issued several statements informing the citizens of Malawi that the stories of blood sucking vampires are all hoaxes. The police, however, have been largely outnumbered by the mobs of angry villagers, and have been unable to control them.