Holyrood's justice committee is to question the lord advocate as it concludes its inquiry into the role of the Crown Office.

Scotland's most senior prosecutor James Wolffe is likely to be quizzed by MSPs on Tuesday on concerns raised by previous witnesses, including whether the service is adequately resourced.

Crown Office and Procurator Fiscal Service (COPFS) employees and unions, victims' groups, lawyers and the police are among those who have already appeared in front of the committee as part of the five-month investigation.

Committee convener Margaret Mitchell said: "The justice committee's inquiry has unearthed some serious concerns about the COPFS.

"From the amount of time wasted through trials not proceeding on schedule, to the workload of prosecutors and the support offered to the victims and witnesses who appear at court.

"The justice committee will publish its conclusions in due course, but we hope that the Lord Advocate will have listened to the legitimate concerns raised so far.

"We are looking for him to address some of the evidence we have heard.

"The professionalism of those working in the COPFS front line is not in question, but we want to ensure that the system around them works just as well as they do and that there is an acceptance by COPFS leadership that there are challenges to confront."

The committee is expected to publish its final report by late winter this year.