The federal government's human resources department says it may be ready this week to reveal how many more people had their personal information stolen in two massive data breaches that it announced last month.

In a blog post issued Saturday night, July 4th, Office of Personnel Management Director Katherine Archuleta told the federal workforce: "Thanks to the tireless efforts of my team at OPM and our inter-agency partners, we also have made progress in the investigation into the attacks on OPM's background information systems. We hope to be able to share more on the scope of that intrusion next week, and in the coming weeks, we will be working hard to issue notifications to those affected."

So far, OPM confirmed that at least 4.2 million current and former federal employees had their sensitive information compromised in cyberattack of its data files back in December, which it made public the beginning of June.

FBI Director James Comey reportedly told senators in a closed-door briefing last month that as many as 18 million Americans' information could be in the hands of hackers. But in a congressional hearing late last month, Archuleta refused to confirm that and said the attack's scope is still being investigated.

"I want you to know that I am as concerned about these incidents as you are," Archuleta told government workers while they celebrated the 4th of July. "I share your anger that adversaries targeted OPM data. And I remain committed to improving the IT issues that have plagued OPM for decades."

She also addressed workers' concerns that the credit-monitoring company OPM contracted with to help affected government employees wasn't up to the task.

"My team has worked with our identity protection contractor to increase staff to handle the large volume of calls, and to dramatically reduce wait times for people seeking services," Archuleta wrote. "As of Friday, our average wait time was about 2 minutes with the longest wait time being about 15 minutes."