New Delhi (CNN) -- A lawyer who says he's representing three of the five men charged with raping and fatally beating a woman on a New Delhi bus said Tuesday that he has advised his clients to plead not guilty. 

"So far they have agreed to my advice, but a clearer picture will emerge by tomorrow evening," the attorney, Manohar Lal Sharma, told CNN. "I fear they might come under pressure to change their mind." 

Sharma said one of those he is representing is Ram Singh, the main accused in the case. The other two are Mukesh Singh and Akshay Thakur, he said. 

The horrific attack on the 23-year-old woman in New Delhi on December 16 has prompted angry protests over the country's treatment of women and handling of sexual attacks. India's interior minister has said he was also working with security officials to strengthen laws regarding rape and assault following the attack, which also stirred outrage worldwide. 

Proceedings against the five adult suspects began Monday, when a New Delhi judge ordered the trial closed after tempers flared inside the packed courtroom. Some lawyers loudly criticized colleagues for offering to represent the suspects, with one young lawyer shouting at Sharma, "You will not defend those barbarians." 

The magistrate, Namrita Aggarwal, ordered that the hearing take place behind closed doors and barred news outlets from publishing proceedings related to the case without the court's permission, citing concerns about the suspects' safety. 

The five men in court this week are charged with murder, rape and kidnapping, and could be sentenced to death if convicted. A juvenile court will take up the matter of determining the age of a sixth suspect, who claims to be 17 and therefore not old enough to be tried as an adult, CNN affiliate IBN reported. 
Who is Sharma representing?
how many suspects are there total?
what does Manohar Lal Sharma do for work?
is the trial open or closed?
how many of the suspects is Sharma representing?
what is one of the charges the men face?
what other charges do they face?
were news outlets allowed in court?
who barred them?
what is the name of the magistrate?
where was the woman fatally beaten?
how old was she?
how did the clients plead?
when did the attack take place?
when did proceedings begin?
Is a juvenile also charged?
how old does he claim to be?
how many suspects are there including him?
who reported the story?
are they an affiliate of CNN?
Ram Singh, Mukesh Singh, and Akshay Thakur.
Sharma said one of those he is representing is Ram Singh, the main accused in the case. The other two are Mukesh Singh and Akshay Thakur, he said. 
five
 five men charged
He's an attorney.
the attorney, Manohar Lal Sharma
Closed.
ordered that the hearing take place behind closed doors
Three
A lawyer who says he's representing three of the five men charged
Raping.
charged with raping and fatally beating a woman
Fatally beating a woman.
fatally beating a woman
No.
 barred news outlets from publishing proceedings related to the case
The magistrate.
The magistrate, Namrita Aggarwal, ordered that the hearing take place behind closed doors and barred news outlets
Namrita Aggarwal
The magistrate, Namrita Aggarwal
On a New Delhi bus.
fatally beating a woman on a New Delhi bus
23
the 23-year-old woman
Not guilty.
he has advised his clients to plead not guilty.
December 16
attack on the 23-year-old woman in New Delhi on December 16
Monday
Proceedings against the five adult suspects began Monday
Possibly.
 A juvenile court will take up the matter of determining the age of a sixth suspect, who claims to be 17
17
claims to be 17
Six
a sixth suspect
IBN.
CNN affiliate IBN reported
Yes.
CNN affiliate IBN