It happened in Drumard Park, Derry.
Detective Inspector Cherith Craig said: “A male resident reported a loud noise outside his home at around 3.45 am.
“Upon examination of his van, which was parked adjacent to the house, damage was noted to its windows and upholstery.
“Police attended the scene and cordoned off the area. ATO were tasked to examine the van and it was determined that a small home made explosive device had gone off inside it.
“Further forensic examinations of the van and the remnants of the device will take place in due course.
“I would appeal to anyone who noticed any suspicious activity in the area to contact CID in Strand Road on 101. Information can also be passed anonymously through Crimstoppers on 0800 555 111.