Damage is believed to be caused by the patient's own immune system.

This major leaning is believed to be caused by the poor foundations.

These are believed to be caused by later intrusions into the early flows.

During most of the 20th century, mental illness was believed to be caused by problematic relationships between children and their parents.

They are believed to be caused by an impact into ice.

The attack was believed to be caused by students of the school.

At the time the disease was believed to be caused by "miasma," or bad air.

The accident was believed to be caused by crew fatigue.

This low diversity is believed to be caused by a massive reduction in the population approximately 100,000 years ago.

The outage was believed to be caused by similar circumstances as the late-2009 event.