Police in north Belfast are advising people to be vigilant and not to go near any suspicious objects.
The warning comes after two hoax pipe bombs were thrown over the perimeter fence at Holy Cross girls' school in Ardoyne this morning.
The British army examined the two objects and declared them hoaxes.
Yesterday, there were over a dozen UDA hoax bomb alerts in Belfast that caused major traffic disruption and gridlock in nationalist parts of the city.