July 31 (Reuters) - Drugmaker Amgen said on Friday ‌hackers stole company ‌data and patient health information ​in a cybersecurity breach involving cloud storage systems run by third-party providers.

On ‌July ⁠29, Amgen determined the incident was material, ⁠based on its evaluation of how many ​files appeared ​to ​be affected ‌and the possibility that the information in those files could be sensitive, it said in a ‌regulatory filing.

The ​company has activated ​its ​cybersecurity response plan, ‌put containment measures ​in ​place, and brought in independent forensic experts ​to ‌investigate.

(Reporting by Padmanabhan Ananthan ​in Bengaluru; Editing by ​Shilpi Majumdar)