Mobile Navbar won't show when clicked

When viewing at mobile screen resolution and you select the mobile nav icon bar, nothing happens. The desired effect is to have the same main navigation be used in mobile. I have ensured my data-targets (mobile_nav) match, and that markup looks good, but am new to Bootstrap. Any help appreciated!

<!DOCTYPE html>

<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="">

<!-- Optional theme -->
<link rel="stylesheet" href="">

<!-- Latest compiled and minified JavaScript -->
<script src=""></script>

<!-- Loading Fonts Awesome CDN from -->
<link href="" rel="stylesheet">


<!-- add padding from best practices for fixed topbar navs -->
        <div class="navbar navbar-default navbar-fixed-top">
            <div class="container">
                    <div class="navbar-header">
                        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#mobile_nav" >
                            <span class="icon-bar"></span>
                            <span class="icon-bar"></span>
                            <span class="icon-bar"></span>
                        <a href="" class="navbar-brand">Brand</a>
                    <div class="collapse navbar-collapse" id="mobile_nav">
                        <ul class="nav navbar-nav">
                            <li><a href="">Link 1</a></li>
                            <li><a href="">Link 2</a></li>
                        <form action="" class="navbar-form navbar-right" role="search">
                            <div class="form-group">
                                    <input type="text" class="form-control" placeholder="Search">
                            <button type="submit" class="btn btn-primary">Submit</button>


Bootstrap requires jQuery to work, you should include it before the Bootstrap JS in your HTML:

<!-- JQuery -->    
<script src=""></script>
<!-- Latest compiled and minified JavaScript -->
<script src=""></script>

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