The First Minister has said terrorism must not be allowed to "triumph" as the terror threat level was raised to "critical".

Increased security measures have been announced, including body and bag searches at the Scottish Cup Final on Saturday.

Security at the Celtic v Aberdeen match at Hampden, as well as other public events, was reviewed after the terror attack at the Manchester Arena which has seen 22 people killed, including children.

Following a meeting of the Scottish Government's resilience committee in the early hours of Wednesday, Nicola Sturgeon urged Scots to go about their business as normal as far as possible.

A "critical" threat level means an attack is expected imminently. Military personnel may be deployed to certain areas as part of the response.

Armed police have been deployed at several locations across Scotland, including at transport hubs such as train stations and outside the Scottish Parliament.

Authorities at Holyrood have increased internal security checks with parliamentary pass holders, including MSPs, having to enter the building through airport-style screening.

The First Minister said: "While raising the UK terror threat level to 'critical' has been judged a necessary response to the despicable attack in Manchester, we must not allow terrorism to triumph.

"I urge the people of Scotland to be vigilant but not alarmed and, as far as possible, to go about their business as usual.

"Police Scotland have already visibly increased their presence in locations such as transport hubs and city centres as a precaution.

"Security arrangements for upcoming public events, including this weekend's Scottish Cup final, are being thoroughly reviewed and the public should anticipate additional safety measures such as full body and bag searches.

"Our emergency services prepare extensively for situations such as this, and those well-rehearsed plans are now being put into practice."

Earlier, Police Scotland's chief constable announced armed officers would be patrolling crowded areas and transport hubs as a precaution.

The force is also supporting the families of two girls from Barra, Laura MacIntyre and Eilidh MacLeod, who were caught up in the attack.

Laura is being treated in hospital in Manchester while Eilidh remains missing.

The First Minister added: "Anyone who was in Manchester and witnessed the terror attack or its immediate aftermath will undoubtedly be feeling stressed or upset.

"Anyone with concerns about themselves or their children should contact their GP for support or NHS 24 if their GP surgery is closed."