How can I add markers and attributes contained in JSON data to an OpenLayers 3 vector layer?

My question is similar to a previous question I asked (How can I add attributes contained in JSON data to an OpenLayers popup?). However, since I originally asked this question, I have upgraded to OpenLayers 3 (OL3) and am having some difficulties.

I am currently displaying an OL3 map using the following snippet code:

    var sourceBingMaps = new ol.source.BingMaps({
    key: '<My API Key>',
    imagerySet: 'Road',
    culture: 'en-us'
   });
    // Microsoft Bing tile source for roads
   var bingMapsRoad = new ol.layer.Tile({
    preload: Infinity,
    source: sourceBingMaps
   });
    var bingMapsAerial = new ol.layer.Tile({
    preload: Infinity,
    source: new ol.source.BingMaps({
    key: '<My API Key>',
    imagerySet: 'AerialWithLabels',
    })
   });

   var map = new ol.Map({
    renderer: 'canvas',
    layers: [bingMapsRoad,bingMapsAerial],
    controls: [],
    target: 'map',
    view: new ol.View({
    center: ol.proj.transform([0,0], 'EPSG:4326', 'EPSG:3857'),
    zoom: 3,
    minZoom: 3,
    maxZoom: 19
    })
   });

The code displays the BING layer without issue. I have a JSON file, with a sample of the data below:

"LOCATION_A": {
      "latitude": 10.2070,
      "longitude": 25.3215,
      "altitude": 1.2,
      "status": "CLOSED",
      "serverAddress": "192.168.0.1"
 }

I am using the code below with jQuery to cycle through the JSON file and place the markers on the BING map layer.

$.getJSON('json/XMIT.json', function(data) {
      $.each(data.markers, function(key, val) {
        var pointFeatures = [];
        var markerName = this.name;
        var markerLocation = this.location;
        var markerLatitude = this.latitude;
        var markerLongitude = this.longitude;
        var markerAltitude = this.altitude;
        var markerStatus = this.commsState;
        var pointGeometry = new ol.geom.Point(ol.proj.transform([markerLongitude, markerLatitude], 'EPSG:4326', 'EPSG:3857'));
        var pointAttributes = {'location': markerLocation, 'latitude': markerLatitude, 
                               'longitude': markerLongitude, 'altitude': markerAltitude, 
                              };


        var pointFeature = new ol.Feature(pointGeometry, pointAttributes, {
            title: markerLocation,
            pointRadius: 16,
            });

        var vectorSource = new.ol.source.Vector({
            projection: 'EPSG:4326'
        });
        vectorSource.addFeatures([pointFeature]);

        var vectorLayer = new ol.layer.Vector({
            source: vectorSource
        });
       }); 
      });

When this code is executed, the browser console provides the following error:

expected expression, got '.'

In regards to this variable:

var vectorSource = new.ol.source.Vector({
        projection: 'EPSG:4326'
        });

Any help with how to accomplish this task is appreciated. Thank you in advance.