diff --git a/yii/bootstrap/Alert.php b/yii/bootstrap/Alert.php
new file mode 100644
index 0000000..2bc4893
--- /dev/null
+++ b/yii/bootstrap/Alert.php
@@ -0,0 +1,153 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\bootstrap;
+
+use Yii;
+use yii\base\Widget;
+use yii\helpers\ArrayHelper;
+use yii\helpers\Html;
+
+/**
+ * Alert renders an alert bootstrap component.
+ *
+ * For example,
+ *
+ * ```php
+ * echo Alert::widget(array(
+ *     'body' => 'Say hello...',
+ *     'closeButton' => array(
+ *         'label' => '&times;',
+ *           'tag' => 'a'
+ *     ),
+ * ));
+ * ```
+ *
+ * The following example will show the content enclosed between the [[begin()]]
+ * and [[end()]] calls within the alert box:
+ *
+ * ```php
+ * Alert::begin(array(
+ *     'closeButton' => array(
+ *            'label' => '&times;'
+ *        )
+ * ));
+ *
+ * echo 'Say hello...';
+ *
+ * Alert::end();
+ * ```
+ *
+ * @see http://twitter.github.io/bootstrap/javascript.html#modals
+ * @author Antonio Ramirez <amigo.cobos@gmail.com>
+ * @since 2.0
+ */
+class Alert extends Widget
+{
+	/**
+	 * @var string the body content in the alert component. Note that anything between
+	 * the [[begin()]] and [[end()]] calls of the Alert widget will also be treated
+	 * as the body content, and will be rendered before this.
+	 */
+	public $body;
+	/**
+	 * @var array the options for rendering the close button tag.
+	 * The close button is displayed in the header of the modal window. Clicking
+	 * on the button will hide the modal window. If this is null, no close button will be rendered.
+	 *
+	 * The following special options are supported:
+	 *
+	 * - tag: string, the tag name of the button. Defaults to 'button'.
+	 * - label: string, the label of the button. Defaults to '&times;'.
+	 *
+	 * The rest of the options will be rendered as the HTML attributes of the button tag.
+	 * Please refer to the [Alert plugin help](http://twitter.github.com/bootstrap/javascript.html#alerts)
+	 * for the supported HTML attributes.
+	 */
+	public $closeButton = array();
+
+	/**
+	 * Initializes the widget.
+	 */
+	public function init()
+	{
+		parent::init();
+
+		$this->initOptions();
+
+		echo Html::beginTag('div', $this->options) . "\n";
+		echo $this->renderBodyBegin() . "\n";
+	}
+
+	/**
+	 * Renders the widget.
+	 */
+	public function run()
+	{
+		echo "\n" . $this->renderBodyEnd();
+		echo "\n" . Html::endTag('div');
+
+		$this->registerPlugin('alert');
+	}
+
+	/**
+	 * Renders the close button if any before rendering the content.
+	 * @return string the rendering result
+	 */
+	protected function renderBodyBegin()
+	{
+		return $this->renderCloseButton();
+	}
+
+	/**
+	 * Renders the alert body (if any).
+	 * @return string the rendering result
+	 */
+	protected function renderBodyEnd()
+	{
+		return $this->body . "\n";
+	}
+
+	/**
+	 * Renders the close button.
+	 * @return string the rendering result
+	 */
+	protected function renderCloseButton()
+	{
+		if ($this->closeButton !== null) {
+			$tag = ArrayHelper::remove($this->closeButton, 'tag', 'button');
+			$label = ArrayHelper::remove($this->closeButton, 'label', '&times;');
+			if ($tag === 'button' && !isset($this->closeButton['type'])) {
+				$this->closeButton['type'] = 'button';
+			}
+			return Html::tag($tag, $label, $this->closeButton);
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 * Initializes the widget options.
+	 * This method sets the default values for various options.
+	 */
+	protected function initOptions()
+	{
+		$this->options = array_merge(array(
+			'class' => 'fade in',
+		), $this->options);
+
+		$this->addCssClass($this->options, 'alert');
+
+		if ($this->closeButton !== null) {
+			$this->closeButton = array_merge(array(
+				'data-dismiss' => 'alert',
+				'aria-hidden' => 'true',
+				'class' => 'close',
+			), $this->closeButton);
+		}
+	}
+}
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