Suspend & resume the kernel timer

I'm using app_timer_set to start a timer, in the handler of this timer, a variable "timerCounter" will be incremented. Somewhere "timerCounter" will be retrieved, I would like to suspend this counter before reading the value of "timeCounter", then resume it again. So I would like to know how to suspend and resume this timer, thanks.

in app_ble_timer_handler(x, x, x, x)
{
timerCounter++;
app_timer_set(SPS_TIMER, TASK_APP, 100);
return (KE_MSG_CONSUMED);
}