The conversation between human and AI assistant.
[|Human|] For the following passage, identify the tone expressed by the author: 

The darkness of the night was oppressive, the air was thick with fear.
[|AI|] The tone expressed by the author in this passage is ominous and foreboding.
[|Human|] 
For the following passage, identify the tone expressed by the author: 

The darkness of the night was oppressive, the air was thick with fear.