How to import multiple jpeg images in R

I'm trying to import multiple black and white images from a folder into R. There is no pattern to the name of each file.

I have tried a couple different approaches:

files <- list.files(path="C:\\images", pattern=".jpeg",all.files=T, full.names=F, no.. = T) 

and

x = readImage(system.file(images, *.png, package=EBImage))

with no luck.

Ultimately I would like to import these images and create a matrix with each row representing an image and each column representing a pixel number, ranging from pixel 0 to pixel 783 (these are 28x28 images so 786 total pixels).

Thanks