def alerts(self, alert_level='High'):
        alerts = self.zap.core.alerts()
        alert_level_value = self.alert_levels[alert_level]
        alerts = sorted((a for a in alerts if self.alert_levels[a['risk']] >= alert_level_value),
                        key=lambda k: self.alert_levels[k['risk']], reverse=True)
        return alerts