WASHINGTON, March 17 (Reuters) - A U.S. House of

Representatives committee on Monday asked the Homeland Security

Department to turn over documents on the federal government's

response to reported massive Chinese hacking incidents.

House Homeland Security Chair Mark Green and the chairs of

two subcommittees asked DHS Secretary Kristi Noem to turn over

records detailing the government's response to two major Chinese

hacking incidents, including "Salt Typhoon," which lawmakers

have called the largest telecommunications hack in U.S. history,

and "Volt Typhoon," which involved espionage into critical

infrastructure organizations.

The Salt Typhoon hack allegedly exposed a huge swathe of

Americans' call logs to Chinese spies and rattled the U.S.

intelligence community. In some cases, hackers are alleged to

have intercepted conversations, including between prominent U.S.

politicians and government officials.

"Despite officials raising the alarm about Volt and Salt

Typhoon, we still know very little about them - except that Volt

Typhoon, in particular, continues to compromise our critical

infrastructure," said the letter also signed by Representatives

Andrew Garbarino and Josh Brecheen.

The Chinese Embassy in Washington and DHS did not

immediately respond to requests for comment.

The committee wants documents related to both hacking

incidents and said the Biden administration did not disclose

details of "Salt Typhoon" until after the incident was reported

by the Wall Street Journal.

The letter seeks by March 31 documents detailing

"actions taken with relevant agencies/departments, industry

stakeholders, victims, and any other relevant parties once the

threat from Volt Typhoon and Salt Typhoon was detected."

The lawmakers want to know when DHS became aware of the

threats and damages caused by the intrusions, and a timeline on

the government's response.

Verizon and AT&T ( T ) have said they were impacted

by Salt Typhoon but said in December their networks are now

secure.

Beijing has denied responsibility for the reported

cyberespionage campaigns.