Module not found: Error: Can't resolve 'url-loader' in が出た場合

下記のようなエラーが出た場合

ERROR in ./~/css-loader!./src/app/css/bootstrap.min.css
Module not found: Error: Can't resolve 'url-loader' in '/Applications/MAMP/htdocs/angular2-seed'
 @ ./~/css-loader!./src/app/css/bootstrap.min.css 6:3278-3330 6:3348-3400
 @ ./src/app/css/bootstrap.min.css
 @ ./src/app/home/home.component.ts
 @ ./src/app/app.module.ts
 @ ./src/main.browser.ts

$ npm install url-loader --save-dev