A teachers union has announced a further strike date after industrial action impacted schools across East Renfrewshire earlier this week.

Members of the Scottish Secondary Teachers' Association (SSTA) will walk out on Wednesday January 11 - the same day that Scotland's largest teaching union, the EIS, is also due to strike in secondary schools.

The co-ordinated action comes after a strike by the EIS last month, and after teachers in the SSTA staged two days of protest this week.

As the date for the latest action was announced, leaders of the STTA challenged Holyrood ministers to act on teacher pay - with the union also warning further strike days were being considered by its executive committee and could be "announced in the coming days".

SSTA president Catherine Nicol said: "If the Scottish Government values its teachers, it must be prepared to act and negotiate sensibly.

"We must have a pay offer that we can take to our members. If not, the SSTA is prepared to take strike action to obtain a fair deal and further our cause."

Teachers have already rejected a deal which would see most staff in classrooms receive a 5% pay rise, although the lowest earning teachers would get a 6.85% increase.

Union demands for a 10% increase have been dismissed as "unaffordable" by Scottish Education Secretary Shirley Anne-Somerville.