The compound was pelted with eggs and dirt bombs on Aug 31 and the estate's mailbox was ripped out of the ground Sep 6, reports contactmusic.com.
The police are unsure if both the incidents are inter-related.
Lohan has been surrounded with problems since a long time. She recently completed a jail sentence and a stint in a rehab for breaching her probation relating to a 2007 Driving Under Influence (DUI) arrest.
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