investigate into

基本解释

The committee will earnestly investigate into the cases and seriously handle the cases.
该委员会正认真调查、严肃处理有关案件。
www.fmprc.gov.cn
Deputy Party Secretary of Baoding City, Li Jianfang, pledged to investigate into what he called an inherited problem and vowed to bring to justice whoever is responsible.
保定市委书记李剑方，承诺将调查他称之为（继承权？）的问题，并将责任人员绳之以法。
blog.sina.com.cn
Earlier, the US spokesperson of Department of Defense also pressed/challenged Chinese Government to investigate into the cyber hacking targeting Google and other companies.
此前美国国防部发言人提出，希望中国政府对包括谷歌在内的企业遭黑客攻击行为进行调查。

Ogden says the Justice Department will also investigate and prosecute those who smuggle guns and cash into Mexico.

The studies Mr. Noer cites are certainly cause to investigate more into the why's of these findings to further understand the issues and perhaps tailor some type of help for the couples at risk.
FORBES: Magazine Article
Dr Marina Singh is sent into the Amazon to investigate the progress of a fertility study that her mentor from medical school, Dr Annick Swenson, is conducting in secret.
ECONOMIST: The call of the Amazon
Seizing upon a request by the Electronic Privacy Information Center to investigate, FCC last week injected itself into the Google Street View matter and, if we may extrapolate, the larger issue of internet privacy.
FORBES: Another Federal Agency Jumps On The Online Privacy Regulatory Roulette Wheel