Christchurch police are investigating a number of ram raids in the city over the last week.

Staff at Cash Convertors Papanui say two people in a silver station wagon reversed into the store's back door around 4am on Sunday.

They say phones, high end laptops and blue tooth speakers were stolen.

It follows another robbery on Wednesday at Hair and beauty salon, Wright Hip Hop Trends.

Owner Larissa Wright says her laptop, TVs and till were untouched.

"We have a really good alarm system and it's real noisy, you can hear it from a block away. So it must have scared them, and that may be why we weren't robbed more."

She says CCTV footage shows a silver Subaru station-wagon was used, which she thinks may be similar to the one used in the ram raid.

However, despite posting the footage online, she says she's still waiting for a visit from police.

"I thought maybe after the ram raid news yesterday and there's a connection there with the car, and they know that we're got footage, that they may have wanted to come and talk to us or at least come in and see what evidence we have. But now, I haven't heard anything at all."

Wright says she has great CCTV footage and an eyewitness.

Also on Sunday morning a car crashed into a bakery on Ferry Road, causing significant damage to the store.

The driver fled, leaving the car at the scene.

It's not clear whether the incidents are linked.