The device was thrown at a house in the Fergleen Mews area at around 2am this morning causing scorch damage to the front door.
Anyone who was in the area at around 2am and who witnessed the attack, or anyone with information that could assist the investigation, is asked to contact Strand Road CID on the non-emergency number 101.
Meanwile Detectives are investigating following an aggravated burglary in Derry.
At approximately 4am this morning two masked males entered a house in the Moss Park area. The pair, believed to have been armed with a handgun and a knife, confronted a 32 year old male in a bedroom demanding money. They struck the householder a number of times causing minor injuries to his nose and arm.
The intruders then made off with a sum of cash.
Officers investigating this incident are keen to hear from witnesses or anyone with any information that could assist the investigation. They can be contacted at Strand Road CID by calling the non-emergency number 101.