'drush dl' command fails on CentOS 7

Hello,

I’m having some issues with drush setup on my server. Runing ‘drush dl’ command returns PHP Fatal error: Call to undefined function Drush\UpdateService\simplexml_load_file()

Don’t know if this is related somehow but this started to happen after I configured my nginx to run with php-fpm (I followed tutorial here)

Some information form terminal

[www-admin@my-host ~]$ drush -vd dl views
Starting Drush preflight. [0.01 sec, 2.23 MB]                                                                                       [preflight]
Cache HIT cid: 8.0-dev-commandfiles-0-87b93096be660a357cdc7a7fe060b103 [0.01 sec, 2.29 MB]                                              [debug]
Scanning into /etc/drush for /.*aliases\.drush(8|)rc\.php$/ [0.04 sec, 4.17 MB]                                                     [sitealias]
Scanning into /etc/drush for /self\.alias\.drush(8|)rc\.php$/ [0.04 sec, 4.17 MB]                                                   [sitealias]
Scanning into /home/www-admin/.composer/vendor/drush/drush/includes/.. for /.*aliases\.drush(8|)rc\.php$/ [0.04 sec, 4.17 MB]       [sitealias]
Scanning into /home/www-admin/.composer/vendor/drush/drush/includes/.. for /self\.alias\.drush(8|)rc\.php$/ [0.04 sec, 4.17 MB]     [sitealias]
Scanning into /home/www-admin/.drush for /.*aliases\.drush(8|)rc\.php$/ [0.04 sec, 4.17 MB]                                         [sitealias]
Scanning into /home/www-admin/.drush for /self\.alias\.drush(8|)rc\.php$/ [0.04 sec, 4.17 MB]                                       [sitealias]
Bootstrap to phase 0. [0.11 sec, 6.1 MB]                                                                                            [bootstrap]
Found command: pm-download (commandfile=pm) [0.11 sec, 6.11 MB]                                                                     [bootstrap]
Loading version_control engine. [0.11 sec, 6.11 MB]                                                                                    [notice]
Loading package_handler engine. [0.11 sec, 6.13 MB]                                                                                    [notice]
Executing: wget --version
Loading release_info engine. [0.12 sec, 6.15 MB]                                                                                       [notice]
Including /home/www-admin/.composer/vendor/drush/drush/commands/pm/download.pm.inc [0.12 sec, 6.2 MB]                               [bootstrap]
Calling hook drush_pm_download_validate [0.12 sec, 6.28 MB]                                                                             [debug]
Returned from hook drush_pm_download_validate [0.12 sec, 6.28 MB]                                                                       [debug]
Calling hook drush_pm_download [0.12 sec, 6.29 MB]                                                                                      [debug]
Downloading release history from https://updates.drupal.org/release-history/views/7.x [0.12 sec, 6.4 MB]                               [notice]
/home/www-admin/.drush/cache/download/https---updates.drupal.org-release-history-views-7.x retrieved from cache. [0.12 sec, 6.4 MB]    [notice]
PHP Fatal error:  Call to undefined function Drush\UpdateService\simplexml_load_file() in /home/www-admin/.composer/vendor/drush/drush/lib/Drush/UpdateService/Project.php on line 72
Drush command terminated abnormally due to an unrecoverable error.                                                                  [error]
Error: Call to undefined function Drush\UpdateService\simplexml_load_file() in
/home/www-admin/.composer/vendor/drush/drush/lib/Drush/UpdateService/Project.php, line 72 [0.13 sec, 6.41 MB]

Here is my nginx.conf file. PHP version 5.6.14 Nginx verison 1.6.3 Drush version 8.0-dev